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