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video/fb: Propagate error code from failing to unregister conflicting fb 

If we fail to remove a conflicting fb driver, we need to abort the
loading of the second driver to avoid likely kernel panics.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Chris Wilson 2013-12-16 15:57:39 +00:00 committed by Dave Airlie
parent 73e9efd4bd
commit 46eeb2c144
2 changed files with 23 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/video/fbmem.c
View File

@ -1577,10 +1577,10 @@ static bool fb_do_apertures_overlap(struct apertures_struct *gena,
static int do_unregister_framebuffer(struct fb_info *fb_info); static int do_unregister_framebuffer(struct fb_info *fb_info);
#define VGA_FB_PHYS 0xA0000 #define VGA_FB_PHYS 0xA0000
static void do_remove_conflicting_framebuffers(struct apertures_struct *a, static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary) const char *name, bool primary)
{ {
int i; int i, ret;
/* check all firmware fbs and kick off if the base addr overlaps */ /* check all firmware fbs and kick off if the base addr overlaps */
for (i = 0 ; i < FB_MAX; i++) { for (i = 0 ; i < FB_MAX; i++) {
@ -1599,22 +1599,29 @@ static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
printk(KERN_INFO "fb: conflicting fb hw usage " printk(KERN_INFO "fb: conflicting fb hw usage "
"%s vs %s - removing generic driver\n", "%s vs %s - removing generic driver\n",
name, registered_fb[i]->fix.id); name, registered_fb[i]->fix.id);
do_unregister_framebuffer(registered_fb[i]); ret = do_unregister_framebuffer(registered_fb[i]);
if (ret)
return ret;
} }
} }
return 0;
} }
static int do_register_framebuffer(struct fb_info *fb_info) static int do_register_framebuffer(struct fb_info *fb_info)
{ {
int i; int i, ret;
struct fb_event event; struct fb_event event;
struct fb_videomode mode; struct fb_videomode mode;
if (fb_check_foreignness(fb_info)) if (fb_check_foreignness(fb_info))
return -ENOSYS; return -ENOSYS;
do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id, ret = do_remove_conflicting_framebuffers(fb_info->apertures,
fb_is_primary_device(fb_info)); fb_info->fix.id,
fb_is_primary_device(fb_info));
if (ret)
return ret;
if (num_registered_fb == FB_MAX) if (num_registered_fb == FB_MAX)
return -ENXIO; return -ENXIO;
@ -1739,12 +1746,16 @@ int unlink_framebuffer(struct fb_info *fb_info)
} }
EXPORT_SYMBOL(unlink_framebuffer); EXPORT_SYMBOL(unlink_framebuffer);
void remove_conflicting_framebuffers(struct apertures_struct *a, int remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary) const char *name, bool primary)
{ {
int ret;
mutex_lock(&registration_lock); mutex_lock(&registration_lock);
do_remove_conflicting_framebuffers(a, name, primary); ret = do_remove_conflicting_framebuffers(a, name, primary);
mutex_unlock(&registration_lock); mutex_unlock(&registration_lock);
return ret;
} }
EXPORT_SYMBOL(remove_conflicting_framebuffers); EXPORT_SYMBOL(remove_conflicting_framebuffers);

4
include/linux/fb.h
View File

@ -613,8 +613,8 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
extern int register_framebuffer(struct fb_info *fb_info); extern int register_framebuffer(struct fb_info *fb_info);
extern int unregister_framebuffer(struct fb_info *fb_info); extern int unregister_framebuffer(struct fb_info *fb_info);
extern int unlink_framebuffer(struct fb_info *fb_info); extern int unlink_framebuffer(struct fb_info *fb_info);
extern void remove_conflicting_framebuffers(struct apertures_struct *a, extern int remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary); const char *name, bool primary);
extern int fb_prepare_logo(struct fb_info *fb_info, int rotate); extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
extern int fb_show_logo(struct fb_info *fb_info, int rotate); extern int fb_show_logo(struct fb_info *fb_info, int rotate);
extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size); extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);