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atmel_lcdfb: fix regression with uninitalized fb_info->mm_lock mutex 

Remove not needed locking of the fb_info->mm_lock mutex before a
frambuffer is registered.

This fixes a problem with uninitialized the fb_info->mm_lock mutex
introduced by the commit 537a1bf059 " fbdev: add mutex for fb_mmap
locking"

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2009-07-08 22:26:16 +02:00 committed by Linus Torvalds
parent b5daa70a4a
commit 1d01e83557
1 changed files with 3 additions and 2 deletions
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5
drivers/video/atmel_lcdfb.c
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@ -261,6 +261,9 @@ static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
/**
* atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
* @sinfo: the frame buffer to allocate memory for
*
* This function is called only from the atmel_lcdfb_probe()
* so no locking by fb_info->mm_lock around smem_len setting is needed.
*/
static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
{
@ -270,9 +273,7 @@ static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
smem_len = (var->xres_virtual * var->yres_virtual
* ((var->bits_per_pixel + 7) / 8));
mutex_lock(&info->mm_lock);
info->fix.smem_len = max(smem_len, sinfo->smem_len);
mutex_unlock(&info->mm_lock);
info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
(dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);