AcoSail/kernel_optimize_test
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/dev/mem: allow rewinding

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commit dcefafb6 ("/dev/mem: dont allow seek to last page") inadvertently
disabled rewinding on /dev/mem.

This broke x86info for example.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Dumazet 2010-04-06 14:35:01 -07:00 committed by Linus Torvalds
parent b1dd3b2843
commit ee5d2acd5c
1 changed files with 0 additions and 5 deletions
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5
drivers/char/mem.c
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@ -710,11 +710,6 @@ static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
switch (orig) { switch (orig) {
case SEEK_CUR: case SEEK_CUR:
offset += file->f_pos; offset += file->f_pos;
if ((unsigned long long)offset <
(unsigned long long)file->f_pos) {
ret = -EOVERFLOW;
break;
}
case SEEK_SET: case SEEK_SET:
/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */ /* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
if ((unsigned long long)offset >= ~0xFFFULL) { if ((unsigned long long)offset >= ~0xFFFULL) {