From: Frode Isaksen <[email protected]>
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]>
---
--- linux-2.6.16.20/fs/select.c.orig.c 2006-06-05 19:18:23.000000000
+0200
+++ linux-2.6.16.20/fs/select.c 2006-06-15 14:20:47.000000000 +0200
@@ -699,9 +699,9 @@ 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)
@@ -709,6 +709,9 @@ asmlinkage long sys_poll(struct pollfd _
else
#endif
timeout_jiffies = msecs_to_jiffies(timeout_msecs);
+ } else {
+ /* Infinite (-1) or no (0) timeout */
+ timeout_jiffies = timeout_msecs;
}
return do_sys_poll(ufds, nfds, &timeout_jiffies);
-
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