diff options
| author | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2022-12-28 21:47:01 +0530 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2023-01-27 12:31:41 +0530 |
| commit | e6cebcc27519dcf1652e604c73b9fd4f416987c0 (patch) | |
| tree | d2655ba5c878e053db01edb1a5682de9de7a8c14 /drivers/bus | |
| parent | 6de4941c0215ac1ea54918ace695a28f4a5ca89b (diff) | |
| download | linux-e6cebcc27519dcf1652e604c73b9fd4f416987c0.tar.gz | |
bus: mhi: ep: Only send -ENOTCONN status if client driver is available
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@vger.kernel.org> # 5.19
Fixes: e827569062a8 ("bus: mhi: ep: Add support for processing command rings")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://lore.kernel.org/r/20221228161704.255268-4-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/mhi/ep/main.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c index 8b065a3cc848f..7d68b00bdbcf8 100644 --- a/drivers/bus/mhi/ep/main.c +++ b/drivers/bus/mhi/ep/main.c @@ -203,9 +203,11 @@ static int mhi_ep_process_cmd_ring(struct mhi_ep_ring *ring, struct mhi_ring_ele 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; @@ -235,9 +237,11 @@ static int mhi_ep_process_cmd_ring(struct mhi_ep_ring *ring, struct mhi_ring_ele 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; |