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| author | Frode Isaksen <frode.isaksen@gmail.com> | 2006-06-25 05:49:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 10:01:22 -0700 |
| commit | 04a3446c90137a473837288b04b517b19dc67a0d (patch) | |
| tree | 874f1681da03441b021f81446e72ace451b0cb09 /fs/select.c | |
| parent | 8bdd1d1250d55afe403ac4affa6ccc5f9e60468f (diff) | |
| download | lwn-04a3446c90137a473837288b04b517b19dc67a0d.tar.gz lwn-04a3446c90137a473837288b04b517b19dc67a0d.zip | |
[PATCH] fs: sys_poll with timeout -1 bug fix
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 <frode.isaksen@gmail.com>
Acked-by: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/select.c')
| -rw-r--r-- | fs/select.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/select.c b/fs/select.c index 9c4f0f2604f1..33b72ba0f86f 100644 --- a/fs/select.c +++ b/fs/select.c @@ -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); |