mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Kees Cook](/assets/img/avatar_default.png)
The kzalloc() function has a 2-factor argument form, kcalloc(). This patch replaces cases of: kzalloc(a * b, gfp) with: kcalloc(a * b, gfp) as well as handling cases of: kzalloc(a * b * c, gfp) with: kzalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kzalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kzalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kzalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kzalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kzalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(char) * COUNT + COUNT , ...) | kzalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kzalloc + kcalloc ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kzalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kzalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kzalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kzalloc(C1 * C2 * C3, ...) | kzalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kzalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kzalloc(sizeof(THING) * C2, ...) | kzalloc(sizeof(TYPE) * C2, ...) | kzalloc(C1 * C2 * C3, ...) | kzalloc(C1 * C2, ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - (E1) * E2 + E1, E2 , ...) | - kzalloc + kcalloc ( - (E1) * (E2) + E1, E2 , ...) | - kzalloc + kcalloc ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
409 lines
9.7 KiB
C
409 lines
9.7 KiB
C
/*
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* drivers/mfd/mfd-core.c
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*
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* core MFD support
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* Copyright (c) 2006 Ian Molton
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* Copyright (c) 2007,2008 Dmitry Baryshkov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <linux/property.h>
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#include <linux/mfd/core.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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static struct device_type mfd_dev_type = {
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.name = "mfd_device",
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};
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int mfd_cell_enable(struct platform_device *pdev)
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{
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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int err = 0;
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/* only call enable hook if the cell wasn't previously enabled */
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if (atomic_inc_return(cell->usage_count) == 1)
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err = cell->enable(pdev);
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/* if the enable hook failed, decrement counter to allow retries */
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if (err)
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atomic_dec(cell->usage_count);
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return err;
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}
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EXPORT_SYMBOL(mfd_cell_enable);
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int mfd_cell_disable(struct platform_device *pdev)
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{
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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int err = 0;
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/* only disable if no other clients are using it */
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if (atomic_dec_return(cell->usage_count) == 0)
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err = cell->disable(pdev);
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/* if the disable hook failed, increment to allow retries */
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if (err)
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atomic_inc(cell->usage_count);
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/* sanity check; did someone call disable too many times? */
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WARN_ON(atomic_read(cell->usage_count) < 0);
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return err;
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}
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EXPORT_SYMBOL(mfd_cell_disable);
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static int mfd_platform_add_cell(struct platform_device *pdev,
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const struct mfd_cell *cell,
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atomic_t *usage_count)
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{
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if (!cell)
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return 0;
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pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
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if (!pdev->mfd_cell)
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return -ENOMEM;
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pdev->mfd_cell->usage_count = usage_count;
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return 0;
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}
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#if IS_ENABLED(CONFIG_ACPI)
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static void mfd_acpi_add_device(const struct mfd_cell *cell,
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struct platform_device *pdev)
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{
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const struct mfd_cell_acpi_match *match = cell->acpi_match;
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struct acpi_device *parent, *child;
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struct acpi_device *adev;
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parent = ACPI_COMPANION(pdev->dev.parent);
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if (!parent)
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return;
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/*
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* MFD child device gets its ACPI handle either from the ACPI device
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* directly under the parent that matches the either _HID or _CID, or
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* _ADR or it will use the parent handle if is no ID is given.
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*
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* Note that use of _ADR is a grey area in the ACPI specification,
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* though Intel Galileo Gen2 is using it to distinguish the children
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* devices.
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*/
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adev = parent;
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if (match) {
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if (match->pnpid) {
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struct acpi_device_id ids[2] = {};
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strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
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list_for_each_entry(child, &parent->children, node) {
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if (!acpi_match_device_ids(child, ids)) {
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adev = child;
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break;
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}
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}
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} else {
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unsigned long long adr;
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acpi_status status;
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list_for_each_entry(child, &parent->children, node) {
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status = acpi_evaluate_integer(child->handle,
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"_ADR", NULL,
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&adr);
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if (ACPI_SUCCESS(status) && match->adr == adr) {
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adev = child;
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break;
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}
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}
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}
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}
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ACPI_COMPANION_SET(&pdev->dev, adev);
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}
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#else
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static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
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struct platform_device *pdev)
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{
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}
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#endif
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static int mfd_add_device(struct device *parent, int id,
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const struct mfd_cell *cell, atomic_t *usage_count,
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struct resource *mem_base,
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int irq_base, struct irq_domain *domain)
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{
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struct resource *res;
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struct platform_device *pdev;
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struct device_node *np = NULL;
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int ret = -ENOMEM;
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int platform_id;
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int r;
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if (id == PLATFORM_DEVID_AUTO)
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platform_id = id;
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else
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platform_id = id + cell->id;
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pdev = platform_device_alloc(cell->name, platform_id);
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if (!pdev)
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goto fail_alloc;
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res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
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if (!res)
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goto fail_device;
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pdev->dev.parent = parent;
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pdev->dev.type = &mfd_dev_type;
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pdev->dev.dma_mask = parent->dma_mask;
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pdev->dev.dma_parms = parent->dma_parms;
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pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
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ret = regulator_bulk_register_supply_alias(
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&pdev->dev, cell->parent_supplies,
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parent, cell->parent_supplies,
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cell->num_parent_supplies);
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if (ret < 0)
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goto fail_res;
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if (parent->of_node && cell->of_compatible) {
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for_each_child_of_node(parent->of_node, np) {
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if (of_device_is_compatible(np, cell->of_compatible)) {
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pdev->dev.of_node = np;
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break;
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}
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}
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}
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mfd_acpi_add_device(cell, pdev);
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if (cell->pdata_size) {
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ret = platform_device_add_data(pdev,
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cell->platform_data, cell->pdata_size);
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if (ret)
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goto fail_alias;
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}
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if (cell->properties) {
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ret = platform_device_add_properties(pdev, cell->properties);
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if (ret)
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goto fail_alias;
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}
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ret = mfd_platform_add_cell(pdev, cell, usage_count);
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if (ret)
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goto fail_alias;
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for (r = 0; r < cell->num_resources; r++) {
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res[r].name = cell->resources[r].name;
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res[r].flags = cell->resources[r].flags;
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/* Find out base to use */
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if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
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res[r].parent = mem_base;
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res[r].start = mem_base->start +
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cell->resources[r].start;
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res[r].end = mem_base->start +
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cell->resources[r].end;
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} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
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if (domain) {
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/* Unable to create mappings for IRQ ranges. */
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WARN_ON(cell->resources[r].start !=
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cell->resources[r].end);
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res[r].start = res[r].end = irq_create_mapping(
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domain, cell->resources[r].start);
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} else {
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res[r].start = irq_base +
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cell->resources[r].start;
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res[r].end = irq_base +
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cell->resources[r].end;
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}
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} else {
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res[r].parent = cell->resources[r].parent;
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res[r].start = cell->resources[r].start;
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res[r].end = cell->resources[r].end;
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}
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if (!cell->ignore_resource_conflicts) {
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if (has_acpi_companion(&pdev->dev)) {
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ret = acpi_check_resource_conflict(&res[r]);
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if (ret)
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goto fail_alias;
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}
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}
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}
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ret = platform_device_add_resources(pdev, res, cell->num_resources);
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if (ret)
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goto fail_alias;
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ret = platform_device_add(pdev);
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if (ret)
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goto fail_alias;
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if (cell->pm_runtime_no_callbacks)
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pm_runtime_no_callbacks(&pdev->dev);
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kfree(res);
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return 0;
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fail_alias:
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regulator_bulk_unregister_supply_alias(&pdev->dev,
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cell->parent_supplies,
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cell->num_parent_supplies);
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fail_res:
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kfree(res);
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fail_device:
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platform_device_put(pdev);
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fail_alloc:
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return ret;
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}
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int mfd_add_devices(struct device *parent, int id,
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const struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base, struct irq_domain *domain)
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{
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int i;
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int ret;
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atomic_t *cnts;
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/* initialize reference counting for all cells */
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cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
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if (!cnts)
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return -ENOMEM;
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for (i = 0; i < n_devs; i++) {
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atomic_set(&cnts[i], 0);
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ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
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irq_base, domain);
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if (ret)
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goto fail;
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}
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return 0;
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fail:
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if (i)
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mfd_remove_devices(parent);
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else
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kfree(cnts);
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return ret;
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}
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EXPORT_SYMBOL(mfd_add_devices);
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static int mfd_remove_devices_fn(struct device *dev, void *c)
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{
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struct platform_device *pdev;
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const struct mfd_cell *cell;
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atomic_t **usage_count = c;
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if (dev->type != &mfd_dev_type)
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return 0;
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pdev = to_platform_device(dev);
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cell = mfd_get_cell(pdev);
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regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
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cell->num_parent_supplies);
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/* find the base address of usage_count pointers (for freeing) */
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if (!*usage_count || (cell->usage_count < *usage_count))
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*usage_count = cell->usage_count;
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platform_device_unregister(pdev);
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return 0;
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}
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void mfd_remove_devices(struct device *parent)
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{
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atomic_t *cnts = NULL;
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device_for_each_child_reverse(parent, &cnts, mfd_remove_devices_fn);
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kfree(cnts);
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}
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EXPORT_SYMBOL(mfd_remove_devices);
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static void devm_mfd_dev_release(struct device *dev, void *res)
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{
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mfd_remove_devices(dev);
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}
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/**
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* devm_mfd_add_devices - Resource managed version of mfd_add_devices()
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*
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* Returns 0 on success or an appropriate negative error number on failure.
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* All child-devices of the MFD will automatically be removed when it gets
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* unbinded.
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*/
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int devm_mfd_add_devices(struct device *dev, int id,
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const struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base, struct irq_domain *domain)
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{
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struct device **ptr;
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int ret;
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ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return -ENOMEM;
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ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
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irq_base, domain);
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if (ret < 0) {
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devres_free(ptr);
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return ret;
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}
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*ptr = dev;
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devres_add(dev, ptr);
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return ret;
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}
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EXPORT_SYMBOL(devm_mfd_add_devices);
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int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
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{
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struct mfd_cell cell_entry;
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struct device *dev;
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struct platform_device *pdev;
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int i;
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/* fetch the parent cell's device (should already be registered!) */
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dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
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if (!dev) {
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printk(KERN_ERR "failed to find device for cell %s\n", cell);
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return -ENODEV;
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}
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pdev = to_platform_device(dev);
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memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
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WARN_ON(!cell_entry.enable);
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for (i = 0; i < n_clones; i++) {
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cell_entry.name = clones[i];
|
|
/* don't give up if a single call fails; just report error */
|
|
if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
|
|
cell_entry.usage_count, NULL, 0, NULL))
|
|
dev_err(dev, "failed to create platform device '%s'\n",
|
|
clones[i]);
|
|
}
|
|
|
|
put_device(dev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mfd_clone_cell);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
|