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[PATCH] fs: sys_poll with timeout -1 bug fix

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If you do a poll() call with timeout -1, the wait will be a big number
(depending on HZ) instead of infinite wait, since -1 is passed to the
msecs_to_jiffies function.

Signed-off-by: Frode Isaksen <[email protected]>
Acked-by: Nishanth Aravamudan <[email protected]>
Cc: David Woodhouse <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Frode Isaksen 2006-06-25 05:49:09 -07:00 • committed by Linus Torvalds
commit 04a3446c90
1 changed files with 5 additions and 2 deletions
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7
fs/select.c
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@ -746,9 +746,9 @@ out_fds:
asmlinkage long sys_poll(struct pollfd __user *ufds, unsigned int nfds,
long timeout_msecs)
{
s64 timeout_jiffies = 0;
s64 timeout_jiffies;
if (timeout_msecs) {
if (timeout_msecs > 0) {
#if HZ > 1000
/* We can only overflow if HZ > 1000 */
if (timeout_msecs / 1000 > (s64)0x7fffffffffffffffULL / (s64)HZ)
@ -756,6 +756,9 @@ asmlinkage long sys_poll(struct pollfd __user *ufds, unsigned int nfds,
else
#endif
timeout_jiffies = msecs_to_jiffies(timeout_msecs);
} else {
/* Infinite (< 0) or no (0) timeout */
timeout_jiffies = timeout_msecs;
}
return do_sys_poll(ufds, nfds, &timeout_jiffies);