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drm: replace DRM_COPY macro w/ a function

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Don't inline it; the compiler can figure it out.  Comments added that are
based upon my interpretation of the code.  Hopefully they're correct. :)

Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Andres Salomon 2009-11-17 14:41:24 -08:00 committed by Dave Airlie
parent 156822f717
commit 140a45fc32
1 changed files with 22 additions and 12 deletions
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34
drivers/gpu/drm/drm_drv.c
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@ -368,14 +368,25 @@ module_exit(drm_core_exit);
/**
* Copy and IOCTL return string to user space
*/
#define DRM_COPY(name, value) \
len = strlen(value); \
if (len > name##_len) len = name##_len; \
name##_len = strlen(value); \
if (len && name) { \
if (copy_to_user(name, value, len)) \
return -EFAULT; \
}
static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
{
int len;
/* don't overflow userbuf */
len = strlen(value);
if (len > *buf_len)
len = *buf_len;
/* let userspace know exact length of driver value (which could be
* larger than the userspace-supplied buffer) */
*buf_len = strlen(value);
/* finally, try filling in the userbuf */
if (len && buf)
if (copy_to_user(buf, value, len))
return -EFAULT;
return 0;
}
/**
* Get version information
@ -392,14 +403,13 @@ static int drm_version(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_version *version = data;
int len;
version->version_major = dev->driver->major;
version->version_minor = dev->driver->minor;
version->version_patchlevel = dev->driver->patchlevel;
DRM_COPY(version->name, dev->driver->name);
DRM_COPY(version->date, dev->driver->date);
DRM_COPY(version->desc, dev->driver->desc);
drm_copy_field(version->name, &version->name_len, dev->driver->name);
drm_copy_field(version->date, &version->date_len, dev->driver->date);
drm_copy_field(version->desc, &version->desc_len, dev->driver->desc);
return 0;
}