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From: Bhaumik Bhatt <bbhatt@codeaurora.org>
To: manivannan.sadhasivam@linaro.org
Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org,
	jhugo@codeaurora.org, linux-kernel@vger.kernel.org,
	carl.yin@quectel.com, naveen.kumar@quectel.com,
	loic.poulain@linaro.org, Bhaumik Bhatt <bbhatt@codeaurora.org>
Subject: [PATCH v7 2/7] bus: mhi: core: Clear context for stopped channels from remove()
Date: Mon, 29 Mar 2021 19:11:42 -0700	[thread overview]
Message-ID: <1617070307-5775-3-git-send-email-bbhatt@codeaurora.org> (raw)
In-Reply-To: <1617070307-5775-1-git-send-email-bbhatt@codeaurora.org>

If a channel was explicitly stopped but not reset and a driver
remove is issued, clean up the channel context such that it is
reflected on the device. This move is useful if a client driver
module is unloaded or a device crash occurs with the host having
placed the channel in a stopped state.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 706484f..bd62efcb 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -1291,7 +1291,8 @@ static int mhi_driver_remove(struct device *dev)
 
 		mutex_lock(&mhi_chan->mutex);
 
-		if (ch_state[dir] == MHI_CH_STATE_ENABLED &&
+		if ((ch_state[dir] == MHI_CH_STATE_ENABLED ||
+		     ch_state[dir] == MHI_CH_STATE_STOP) &&
 		    !mhi_chan->offload_ch)
 			mhi_deinit_chan_ctxt(mhi_cntrl, mhi_chan);
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


  parent reply	other threads:[~2021-03-30  2:13 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-30  2:11 [PATCH v7 0/7] Updates to MHI channel handling Bhaumik Bhatt
2021-03-30  2:11 ` [PATCH v7 1/7] bus: mhi: core: Allow sending the STOP channel command Bhaumik Bhatt
2021-03-30  2:11 ` Bhaumik Bhatt [this message]
2021-03-30  2:11 ` [PATCH v7 3/7] bus: mhi: core: Improvements to the channel handling state machine Bhaumik Bhatt
2021-03-31 11:35   ` Manivannan Sadhasivam
2021-03-30  2:11 ` [PATCH v7 4/7] bus: mhi: core: Clear configuration from channel context during reset Bhaumik Bhatt
2021-03-30  2:11 ` [PATCH v7 5/7] bus: mhi: core: Check channel execution environment before issuing reset Bhaumik Bhatt
2021-03-30  2:11 ` [PATCH v7 6/7] bus: mhi: core: Remove __ prefix for MHI channel unprepare function Bhaumik Bhatt
2021-03-30  2:11 ` [PATCH v7 7/7] bus: mhi: Improve documentation on channel transfer setup APIs Bhaumik Bhatt
2021-03-31 11:36 ` [PATCH v7 0/7] Updates to MHI channel handling Manivannan Sadhasivam

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