From: Soren Andersen <s.andersen@samsung.com>
Date: Thu, 29 Nov 2018 12:45:06 +0000 (+0100)
Subject: [9610] wlbt: Add memory barrier in BT IRQ handler
X-Git-Tag: MMI-QSAS30.62-33-3~875
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d31352271aba0705ea6af3fc73de4a92f0b50b45;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

[9610] wlbt: Add memory barrier in BT IRQ handler

Added a memory barrier in the IRQ handler for BT,
to ensure that the irq bit is cleared before starting
to read the shared mailbox indexes.

Change-Id: I9b3979695bc23dd09c3a46a2f3130aa81e949ec4
SCSC-Bug-Id: SSB-46925
Signed-off-by: Soren Andersen <s.andersen@samsung.com>
---

diff --git a/drivers/misc/samsung/scsc_bt/scsc_shm.c b/drivers/misc/samsung/scsc_bt/scsc_shm.c
index 12e0903dfd33..e1786b37aaab 100755
--- a/drivers/misc/samsung/scsc_bt/scsc_shm.c
+++ b/drivers/misc/samsung/scsc_bt/scsc_shm.c
@@ -51,6 +51,8 @@ static void scsc_bt_shm_irq_handler(int irqbit, void *data)
 {
 	/* Clear interrupt */
 	scsc_service_mifintrbit_bit_clear(bt_service.service, irqbit);
+
+	/* Ensure irq bit is cleared before reading the mailbox indexes */
 	mb();
 
 	bt_service.interrupt_count++;