Commit b2b163bb authored Sep 17, 2010 by Russell King

ARM: prevent multiple syscall restarts



Al Viro reports that calling "sys_sigsuspend(-ERESTARTNOHAND, 0, 0)"
with two signals coming and being handled in kernel space results
in the syscall restart being done twice.

Avoid this by clearing the 'why' flag when we call the signal handling
code to prevent further syscall restarts after the first.

Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 1a8e41cd

arch/arm/kernel/entry-common.S

+2 −0

Original line number	Diff line number	Diff line
		@@ -48,6 +48,8 @@ work_pending:
		beq no_work_pending
		mov r0, sp @ 'regs'
		mov r2, why @ 'syscall'
		tst r1, #_TIF_SIGPENDING @ delivering a signal?
		movne why, #0 @ prevent further restarts
		bl do_notify_resume
		b ret_slow_syscall @ Check work again