irqchip/gicv3: Handle loop timeout proper

commit d102eb5c1ac5e6743b1c6d145c06a25d98ad1375 upstream.

The timeout loop terminates when the loop count is zero, but the decrement
of the count variable is post check. So count is -1 when we check for the
timeout and therefor the error message is supressed.

Change it to predecrement, so the error message is emitted.

[ tglx: Massaged changelog ]

Fixes: a2c225101234 ("irqchip: gic-v3: Refactor gic_enable_redist to support both enabling and disabling")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: kernel-janitors@vger.kernel.org
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/20161014072534.GA15168@mwanda
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 44aa57edf20721139c32de4b18d6e3615798bfff..e33c729b9f48d58b89727103f3a0de1be61cdf77 100644 (file)
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -142,7 +142,7 @@ static void gic_enable_redist(bool enable)
                        return; /* No PM support in this redistributor */
        }
 
-       while (count--) {
+       while (--count) {
                val = readl_relaxed(rbase + GICR_WAKER);
                if (enable ^ (val & GICR_WAKER_ChildrenAsleep))
                        break;