linux-kernel - [PATCH v1 04/10] bus: mhi: core: Use the IRQF

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Date:   Fri, 18 Sep 2020 19:02:29 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org,
        Bhaumik Bhatt <bbhatt@...eaurora.org>
Subject: [PATCH v1 04/10] bus: mhi: core: Use the IRQF_ONESHOT flag for the BHI interrupt line

Remove the IRQF_SHARED flag as it is not needed for the BHI interrupt
and replace it with IRQF_ONESHOT so that host can be sure that the
next BHI hard interrupt is triggered only when the threaded interrupt
handler has returned. This is to avoid any race conditions we may run
into if BHI interrupts fire one after another.

Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
---
 drivers/bus/mhi/core/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index ca32563..9ae4c19 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -167,7 +167,7 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl)
 	/* Setup BHI_INTVEC IRQ */
 	ret = request_threaded_irq(mhi_cntrl->irq[0], mhi_intvec_handler,
 				   mhi_intvec_threaded_handler,
-				   IRQF_SHARED | IRQF_NO_SUSPEND,
+				   IRQF_ONESHOT | IRQF_NO_SUSPEND,
 				   "bhi", mhi_cntrl);
 	if (ret)
 		return ret;
-- 
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