arm: if we get into work_pending while returning to kernel mode, just go away
checking in do_signal() is pointless - if we get there with !user_mode(regs)
(and we might), we'll end up looping indefinitely. Check in work_pending
and break out of the loop if so.
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 82aaf0a..b669b49 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -56,7 +56,10 @@
/*
* TIF_SIGPENDING or TIF_NOTIFY_RESUME must've been set if we got here
*/
+ ldr r2, [sp, #S_PSR]
mov r0, sp @ 'regs'
+ tst r2, #15 @ are we returning to user mode?
+ bne no_work_pending @ no? just leave, then...
mov r2, why @ 'syscall'
tst r1, #_TIF_SIGPENDING @ delivering a signal?
movne why, #0 @ prevent further restarts