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| author | Antonino A. Daplas <adaplas@gmail.com> | 2006-04-18 22:22:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-19 09:13:54 -0700 |
| commit | 6a2a88668e90cd2459d0493e3e3ff17c3557febc (patch) | |
| tree | f2a2b2426312541731082b8c6915e80727337a27 /drivers/video/fbmem.c | |
| parent | a61bdaad6c696e850d8fa412f1f201cbca51ad30 (diff) | |
| download | lwn-6a2a88668e90cd2459d0493e3e3ff17c3557febc.tar.gz lwn-6a2a88668e90cd2459d0493e3e3ff17c3557febc.zip | |
[PATCH] fbdev: Fix return error of fb_write
Fix return code of fb_write():
If at least 1 byte was transferred to the device, return number of bytes,
otherwise:
- return -EFBIG - if file offset is past the maximum allowable offset or
size is greater than framebuffer length
- return -ENOSPC - if size is greater than framebuffer length - offset
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/fbmem.c')
| -rw-r--r-- | drivers/video/fbmem.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index 8d8eadb64853..372aa1776827 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -674,13 +674,19 @@ fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) total_size = info->fix.smem_len; if (p > total_size) - return 0; + return -EFBIG; - if (count >= total_size) + if (count > total_size) { + err = -EFBIG; count = total_size; + } + + if (count + p > total_size) { + if (!err) + err = -ENOSPC; - if (count + p > total_size) count = total_size - p; + } buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, GFP_KERNEL); @@ -722,7 +728,7 @@ fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) kfree(buffer); - return (err) ? err : cnt; + return (cnt) ? cnt : err; } #ifdef CONFIG_KMOD |