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authorBernd Schmidt <bernds_cb1@t-online.de>2009-01-13 22:14:48 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-13 14:45:17 -0800
commit62568510b8e2679cbc331d7de10ea9ba81ae8b3d (patch)
tree6a0d4d7b6d50737c1bfcf93a74ad46855c244dc9 /fs/select.c
parent125c97d8a59888c5678734c2b70cbd08c847bd99 (diff)
downloadlwn-62568510b8e2679cbc331d7de10ea9ba81ae8b3d.tar.gz
lwn-62568510b8e2679cbc331d7de10ea9ba81ae8b3d.zip
Fix timeouts in sys_pselect7
Since we (Analog Devices) updated our Blackfin kernel to 2.6.28, we've seen occasional 5-second hangs from telnet. telnetd calls select with a NULL timeout, but with the new kernel, the system call occasionally returns 0, which causes telnet to call sleep (5). This did not happen with earlier kernels. The code in sys_pselect7 looks a bit strange, in particular the variable "to" is initialized to NULL, then changed if a non-null timeout was passed in, but not used further. It needs to be passed to core_sys_select instead of &end_time. This bug was introduced by 8ff3e8e85fa6c312051134b3953e397feb639f51 ("select: switch select() and poll() over to hrtimers"). Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com> Reviewed-by: Ulrich Drepper <drepper@redhat.com> Tested-by: Robin Getz <rgetz@blackfin.uclinux.org> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/select.c')
-rw-r--r--fs/select.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/select.c b/fs/select.c
index 08b91beed806..b0cf1f0896d9 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -610,7 +610,7 @@ asmlinkage long sys_pselect7(int n, fd_set __user *inp, fd_set __user *outp,
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
- ret = core_sys_select(n, inp, outp, exp, &end_time);
+ ret = core_sys_select(n, inp, outp, exp, to);
ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
if (ret == -ERESTARTNOHAND) {