[tip:irq/urgent] irqchip/gicv3: Handle loop timeout proper

From: tip-bot for Dan Carpenter
Date: Fri Oct 14 2016 - 08:32:17 EST

Commit-ID: d102eb5c1ac5e6743b1c6d145c06a25d98ad1375
Gitweb: http://git.kernel.org/tip/d102eb5c1ac5e6743b1c6d145c06a25d98ad1375
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
AuthorDate: Fri, 14 Oct 2016 10:26:21 +0300
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 14 Oct 2016 14:26:55 +0200

irqchip/gicv3: Handle loop timeout proper

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@xxxxxxxxxx>
Acked-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: kernel-janitors@xxxxxxxxxxxxxxx
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: 20161014072534.GA15168@mwanda">http://lkml.kernel.org/r/20161014072534.GA15168@mwanda
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

drivers/irqchip/irq-gic-v3.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 9b81bd8..19d642e 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -153,7 +153,7 @@ 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 ^ (bool)(val & GICR_WAKER_ChildrenAsleep))