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authorFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>2009-09-22 23:47:44 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 14:39:56 (GMT)
commit0fcf6ada2b8eb42d132c0846384f1299889609e3 (patch)
treeb6b9e2996eb621d6ab03d1d8ac5e00ce070cea76 /drivers/video/fbmem.c
parent360fa58828784f307c3977d5ff4c8e400f074a56 (diff)
fb: do not ignore fb_set_par errors
At the moment about half of the framebuffer drivers can return an error code in fb_set_par. Until now it would be silently ignored by fbmem.c and fbcon.c. This patch fixes fbmem.c to return the error code and restore var on error. But it is not clear in which video mode the device is when fb_set_par fails. It would be good and reasonable if it were in the old state but there is no guarantee that this is true for all existing drivers. Additionally print a message if a failing fb_set_par is detected in fbmem.c or fbcon.c. Although most errors should be caught by the previous fb_check_var some errors can't as they are dynamic (memory allocations, ...) and can only be detected while performing the operations which is forbidden in fb_check_var. This patch shouldn't have a negative impact on normal operation as all drivers return 0 on success. The impact in case of error depends heavily on the driver and caller but it's expected to be better than before. Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/fbmem.c')
-rw-r--r--drivers/video/fbmem.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 346f257..a1f2e7c 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -954,6 +954,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
goto done;
if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
+ struct fb_var_screeninfo old_var;
struct fb_videomode mode;
if (info->fbops->fb_get_caps) {
@@ -963,10 +964,20 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
goto done;
}
+ old_var = info->var;
info->var = *var;
- if (info->fbops->fb_set_par)
- info->fbops->fb_set_par(info);
+ if (info->fbops->fb_set_par) {
+ ret = info->fbops->fb_set_par(info);
+
+ if (ret) {
+ info->var = old_var;
+ printk(KERN_WARNING "detected "
+ "fb_set_par error, "
+ "error code: %d\n", ret);
+ goto done;
+ }
+ }
fb_pan_display(info, &info->var);
fb_set_cmap(&info->cmap, info);

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