This is a note to let you know that I've just added the patch titled
bus: mhi: ep: Only send -ENOTCONN status if client driver is available
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bus-mhi-ep-only-send-enotconn-status-if-client-driver-is-available.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e6cebcc27519dcf1652e604c73b9fd4f416987c0 Mon Sep 17 00:00:00 2001
From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Date: Wed, 28 Dec 2022 21:47:01 +0530
Subject: bus: mhi: ep: Only send -ENOTCONN status if client driver is available
From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
commit e6cebcc27519dcf1652e604c73b9fd4f416987c0 upstream.
For the STOP and RESET commands, only send the channel disconnect status
-ENOTCONN if client driver is available. Otherwise, it will result in
null pointer dereference.
Cc: <stable@xxxxxxxxxxxxxxx> # 5.19
Fixes: e827569062a8 ("bus: mhi: ep: Add support for processing command rings")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Reviewed-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221228161704.255268-4-manivannan.sadhasivam@xxxxxxxxxx
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/bus/mhi/ep/main.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
--- a/drivers/bus/mhi/ep/main.c
+++ b/drivers/bus/mhi/ep/main.c
@@ -196,9 +196,11 @@ static int mhi_ep_process_cmd_ring(struc
mhi_ep_mmio_disable_chdb(mhi_cntrl, ch_id);
/* Send channel disconnect status to client drivers */
- result.transaction_status = -ENOTCONN;
- result.bytes_xferd = 0;
- mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
+ if (mhi_chan->xfer_cb) {
+ result.transaction_status = -ENOTCONN;
+ result.bytes_xferd = 0;
+ mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
+ }
/* Set channel state to STOP */
mhi_chan->state = MHI_CH_STATE_STOP;
@@ -228,9 +230,11 @@ static int mhi_ep_process_cmd_ring(struc
mhi_ep_ring_reset(mhi_cntrl, ch_ring);
/* Send channel disconnect status to client driver */
- result.transaction_status = -ENOTCONN;
- result.bytes_xferd = 0;
- mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
+ if (mhi_chan->xfer_cb) {
+ result.transaction_status = -ENOTCONN;
+ result.bytes_xferd = 0;
+ mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
+ }
/* Set channel state to DISABLED */
mhi_chan->state = MHI_CH_STATE_DISABLED;
Patches currently in stable-queue which might be from manivannan.sadhasivam@xxxxxxxxxx are
queue-6.2/bus-mhi-ep-save-channel-state-locally-during-suspend-and-resume.patch
queue-6.2/remoteproc-qcom_q6v5_mss-use-a-carveout-to-authentic.patch
queue-6.2/arm-dts-qcom-sdx55-add-qcom-smmu-500-as-the-fallback-for-iommu-node.patch
queue-6.2/bus-mhi-ep-move-chan-lock-to-the-start-of-processing-queued-ch-ring.patch
queue-6.2/bus-mhi-ep-only-send-enotconn-status-if-client-driver-is-available.patch
queue-6.2/revert-remoteproc-qcom_q6v5_mss-map-unmap-metadata-r.patch
queue-6.2/dmaengine-dw-edma-fix-missing-src-dst-address-of-int.patch
queue-6.2/arm-dts-qcom-sdx65-add-qcom-smmu-500-as-the-fallback-for-iommu-node.patch
