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 <m...@dbalan.in>
---
drivers/staging/sm750fb/sm750.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)
diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
index d5934f372387..af5c3c93a077 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,
--
2.13.2
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