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authorAntonino A. Daplas <adaplas@gmail.com>2006-04-18 22:22:12 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-19 09:13:54 -0700
commit6a2a88668e90cd2459d0493e3e3ff17c3557febc (patch)
treef2a2b2426312541731082b8c6915e80727337a27 /drivers/video/fbmem.c
parenta61bdaad6c696e850d8fa412f1f201cbca51ad30 (diff)
[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.c14
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