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![Joachim Fenkes](/assets/img/avatar_default.png)
Recent of_platform changes made of_bus_type_init() overwrite the bus type's .dev_attrs list, meaning that the "name" attribute that ibmebus devices previously had is no longer present. This is a user-visible regression which breaks the userspace eHCA support, since the eHCA userspace driver relies on the name attribute to check for valid adapters. This fixes it by providing the "name" attribute in the generic OF device code instead. Tested on POWER. Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
164 lines
3.6 KiB
C
164 lines
3.6 KiB
C
#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <asm/errno.h>
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/**
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* of_match_device - Tell if an of_device structure has a matching
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* of_match structure
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* @ids: array of of device match structures to search in
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* @dev: the of device structure to match against
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*
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* Used by a driver to check whether an of_device present in the
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* system is in its list of supported devices.
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*/
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const struct of_device_id *of_match_device(const struct of_device_id *matches,
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const struct of_device *dev)
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{
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if (!dev->node)
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return NULL;
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return of_match_node(matches, dev->node);
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}
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EXPORT_SYMBOL(of_match_device);
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struct of_device *of_dev_get(struct of_device *dev)
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{
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struct device *tmp;
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if (!dev)
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return NULL;
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tmp = get_device(&dev->dev);
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if (tmp)
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return to_of_device(tmp);
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else
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return NULL;
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}
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EXPORT_SYMBOL(of_dev_get);
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void of_dev_put(struct of_device *dev)
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{
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if (dev)
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put_device(&dev->dev);
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}
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EXPORT_SYMBOL(of_dev_put);
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static ssize_t devspec_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct of_device *ofdev;
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ofdev = to_of_device(dev);
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return sprintf(buf, "%s\n", ofdev->node->full_name);
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}
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static ssize_t name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct of_device *ofdev;
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ofdev = to_of_device(dev);
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return sprintf(buf, "%s\n", ofdev->node->name);
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}
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct of_device *ofdev = to_of_device(dev);
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ssize_t len = 0;
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len = of_device_get_modalias(ofdev, buf, PAGE_SIZE - 2);
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buf[len] = '\n';
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buf[len+1] = 0;
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return len+1;
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}
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struct device_attribute of_platform_device_attrs[] = {
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__ATTR_RO(devspec),
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__ATTR_RO(name),
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__ATTR_RO(modalias),
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__ATTR_NULL
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};
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/**
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* of_release_dev - free an of device structure when all users of it are finished.
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* @dev: device that's been disconnected
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*
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* Will be called only by the device core when all users of this of device are
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* done.
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*/
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void of_release_dev(struct device *dev)
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{
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struct of_device *ofdev;
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ofdev = to_of_device(dev);
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of_node_put(ofdev->node);
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kfree(ofdev);
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}
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EXPORT_SYMBOL(of_release_dev);
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int of_device_register(struct of_device *ofdev)
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{
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BUG_ON(ofdev->node == NULL);
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return device_register(&ofdev->dev);
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}
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EXPORT_SYMBOL(of_device_register);
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void of_device_unregister(struct of_device *ofdev)
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{
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device_unregister(&ofdev->dev);
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}
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EXPORT_SYMBOL(of_device_unregister);
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ssize_t of_device_get_modalias(struct of_device *ofdev,
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char *str, ssize_t len)
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{
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const char *compat;
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int cplen, i;
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ssize_t tsize, csize, repend;
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/* Name & Type */
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csize = snprintf(str, len, "of:N%sT%s",
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ofdev->node->name, ofdev->node->type);
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/* Get compatible property if any */
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compat = of_get_property(ofdev->node, "compatible", &cplen);
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if (!compat)
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return csize;
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/* Find true end (we tolerate multiple \0 at the end */
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for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
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cplen--;
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if (!cplen)
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return csize;
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cplen++;
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/* Check space (need cplen+1 chars including final \0) */
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tsize = csize + cplen;
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repend = tsize;
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if (csize >= len) /* @ the limit, all is already filled */
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return tsize;
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if (tsize >= len) { /* limit compat list */
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cplen = len - csize - 1;
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repend = len;
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}
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/* Copy and do char replacement */
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memcpy(&str[csize + 1], compat, cplen);
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for (i = csize; i < repend; i++) {
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char c = str[i];
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if (c == '\0')
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str[i] = 'C';
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else if (c == ' ')
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str[i] = '_';
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}
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return tsize;
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}
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