diff options
| author | Dhananjay Balan <mail@dbalan.in> | 2017-06-29 13:24:35 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-29 16:38:50 +0200 |
| commit | 97af1ce27844a4303139b06df962e3a8d738d23b (patch) | |
| tree | 18814c81ff201a98e6d37d455ef8ae13f9e1c526 | |
| parent | staging: speakup: make ttyio synths use device name (diff) | |
| download | linux-97af1ce27844a4303139b06df962e3a8d738d23b.tar.xz linux-97af1ce27844a4303139b06df962e3a8d738d23b.zip | |
drivers: staging: sm750: Hold lock irrespective of fb numbers.
Start holding the lock for all cases irrespective of number of fb,
there could be a deadlock since this number could change in the
lifetime of this lock
Signed-off-by: Dhananjay Balan <mail@dbalan.in>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/sm750fb/sm750.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c index 664c220f1df4..3aa4128703d5 100644 --- a/drivers/staging/sm750fb/sm750.c +++ b/drivers/staging/sm750fb/sm750.c @@ -183,19 +183,19 @@ static void lynxfb_ops_fillrect(struct fb_info *info, rop = (region->rop != ROP_COPY) ? HW_ROP2_XOR : HW_ROP2_COPY; /* - * If not use spin_lock,system will die if user load driver + * If not use spin_lock, system will die if user load driver * and immediately unload driver frequently (dual) + * since they fb_count could change during the lifetime of + * this lock, we are holding it for all cases. */ - if (sm750_dev->fb_count > 1) - spin_lock(&sm750_dev->slock); + spin_lock(&sm750_dev->slock); sm750_dev->accel.de_fillrect(&sm750_dev->accel, base, pitch, Bpp, region->dx, region->dy, region->width, region->height, color, rop); - if (sm750_dev->fb_count > 1) - spin_unlock(&sm750_dev->slock); + spin_unlock(&sm750_dev->slock); } static void lynxfb_ops_copyarea(struct fb_info *info, @@ -219,17 +219,17 @@ static void lynxfb_ops_copyarea(struct fb_info *info, /* * If not use spin_lock, system will die if user load driver * and immediately unload driver frequently (dual) + * since they fb_count could change during the lifetime of + * this lock, we are holding it for all cases. */ - if (sm750_dev->fb_count > 1) - spin_lock(&sm750_dev->slock); + spin_lock(&sm750_dev->slock); sm750_dev->accel.de_copyarea(&sm750_dev->accel, base, pitch, region->sx, region->sy, base, pitch, Bpp, region->dx, region->dy, region->width, region->height, HW_ROP2_COPY); - if (sm750_dev->fb_count > 1) - spin_unlock(&sm750_dev->slock); + spin_unlock(&sm750_dev->slock); } static void lynxfb_ops_imageblit(struct fb_info *info, @@ -268,9 +268,10 @@ static void lynxfb_ops_imageblit(struct fb_info *info, /* * If not use spin_lock, system will die if user load driver * and immediately unload driver frequently (dual) + * since they fb_count could change during the lifetime of + * this lock, we are holding it for all cases. */ - if (sm750_dev->fb_count > 1) - spin_lock(&sm750_dev->slock); + spin_lock(&sm750_dev->slock); sm750_dev->accel.de_imageblit(&sm750_dev->accel, image->data, image->width >> 3, 0, @@ -278,8 +279,7 @@ static void lynxfb_ops_imageblit(struct fb_info *info, image->dx, image->dy, image->width, image->height, fgcol, bgcol, HW_ROP2_COPY); - if (sm750_dev->fb_count > 1) - spin_unlock(&sm750_dev->slock); + spin_unlock(&sm750_dev->slock); } static int lynxfb_ops_pan_display(struct fb_var_screeninfo *var, |