diff mbox series

[6/6] bus: mhi: ep: Save channel state locally during suspend and resume

Message ID 20221228161704.255268-7-manivannan.sadhasivam@linaro.org
State New
Headers
Series MHI EP fixes and improvements |

Commit Message

Manivannan Sadhasivam Dec. 28, 2022, 4:17 p.m. UTC 
  During suspend and resume, the channel state needs to be saved locally.
Otherwise, the endpoint may access the channels while they were being
suspended and causing access violations.

Fix it by saving the channel state locally during suspend and resume.

Cc: <stable@vger.kernel.org> # 5.19
Fixes: e4b7b5f0f30a ("bus: mhi: ep: Add support for suspending and resuming channels")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/ep/main.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Jeffrey Hugo Jan. 5, 2023, 3:57 p.m. UTC | #1 
On 12/28/2022 9:17 AM, Manivannan Sadhasivam wrote:
> During suspend and resume, the channel state needs to be saved locally.
> Otherwise, the endpoint may access the channels while they were being
> suspended and causing access violations.
> 
> Fix it by saving the channel state locally during suspend and resume.
> 
> Cc: <stable@vger.kernel.org> # 5.19
> Fixes: e4b7b5f0f30a ("bus: mhi: ep: Add support for suspending and resuming channels")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com)
diff mbox series

Patch

diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
index 2362fcc8b32c..bcaaba97ef63 100644
--- a/drivers/bus/mhi/ep/main.c
+++ b/drivers/bus/mhi/ep/main.c
@@ -1122,6 +1122,7 @@  void mhi_ep_suspend_channels(struct mhi_ep_cntrl *mhi_cntrl)
 
 		dev_dbg(&mhi_chan->mhi_dev->dev, "Suspending channel\n");
 		/* Set channel state to SUSPENDED */
+		mhi_chan->state = MHI_CH_STATE_SUSPENDED;
 		tmp &= ~CHAN_CTX_CHSTATE_MASK;
 		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_SUSPENDED);
 		mhi_cntrl->ch_ctx_cache[i].chcfg = cpu_to_le32(tmp);
@@ -1151,6 +1152,7 @@  void mhi_ep_resume_channels(struct mhi_ep_cntrl *mhi_cntrl)
 
 		dev_dbg(&mhi_chan->mhi_dev->dev, "Resuming channel\n");
 		/* Set channel state to RUNNING */
+		mhi_chan->state = MHI_CH_STATE_RUNNING;
 		tmp &= ~CHAN_CTX_CHSTATE_MASK;
 		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_RUNNING);
 		mhi_cntrl->ch_ctx_cache[i].chcfg = cpu_to_le32(tmp);