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15f83bb019
The driver core ignores the return value of scmdev_remove() (because there is only little it can do when a device disappears). So make it impossible for future drivers to return an unused error code by changing the remove prototype to return void. The real motivation for this change is the quest to make struct bus_type::remove return void, too. Reviewed-by: Cornelia Huck <cohuck@redhat.com> Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20210713193522.1770306-5-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Device driver for s390 storage class memory.
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*
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* Copyright IBM Corp. 2012
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* Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
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*/
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#define KMSG_COMPONENT "scm_block"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <asm/eadm.h>
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#include "scm_blk.h"
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static void scm_notify(struct scm_device *scmdev, enum scm_event event)
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{
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struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
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switch (event) {
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case SCM_CHANGE:
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pr_info("%lx: The capabilities of the SCM increment changed\n",
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(unsigned long) scmdev->address);
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SCM_LOG(2, "State changed");
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SCM_LOG_STATE(2, scmdev);
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break;
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case SCM_AVAIL:
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SCM_LOG(2, "Increment available");
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SCM_LOG_STATE(2, scmdev);
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scm_blk_set_available(bdev);
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break;
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}
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}
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static int scm_probe(struct scm_device *scmdev)
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{
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struct scm_blk_dev *bdev;
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int ret;
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SCM_LOG(2, "probe");
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SCM_LOG_STATE(2, scmdev);
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if (scmdev->attrs.oper_state != OP_STATE_GOOD)
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return -EINVAL;
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bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
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if (!bdev)
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return -ENOMEM;
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dev_set_drvdata(&scmdev->dev, bdev);
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ret = scm_blk_dev_setup(bdev, scmdev);
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if (ret) {
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dev_set_drvdata(&scmdev->dev, NULL);
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kfree(bdev);
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goto out;
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}
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out:
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return ret;
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}
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static void scm_remove(struct scm_device *scmdev)
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{
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struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
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scm_blk_dev_cleanup(bdev);
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dev_set_drvdata(&scmdev->dev, NULL);
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kfree(bdev);
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}
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static struct scm_driver scm_drv = {
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.drv = {
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.name = "scm_block",
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.owner = THIS_MODULE,
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},
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.notify = scm_notify,
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.probe = scm_probe,
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.remove = scm_remove,
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.handler = scm_blk_irq,
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};
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int __init scm_drv_init(void)
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{
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return scm_driver_register(&scm_drv);
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}
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void scm_drv_cleanup(void)
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{
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scm_driver_unregister(&scm_drv);
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}
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