This is a note to let you know that I've just added the patch titled bus: mhi: core: Clear configuration from channel context during reset to the 5.10-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-core-clear-configuration-from-channel-context-during-reset.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 47705c08465931923e2f2b506986ca0bdf80380d Mon Sep 17 00:00:00 2001 From: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx> Date: Thu, 1 Apr 2021 14:16:15 -0700 Subject: bus: mhi: core: Clear configuration from channel context during reset From: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx> commit 47705c08465931923e2f2b506986ca0bdf80380d upstream. When clearing up the channel context after client drivers are done using channels, the configuration is currently not being reset entirely. Ensure this is done to appropriately handle issues where clients unaware of the context state end up calling functions which expect a context. Signed-off-by: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx> Reviewed-by: Hemant Kumar <hemantk@xxxxxxxxxxxxxx> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> Link: https://lore.kernel.org/r/1617311778-1254-7-git-send-email-bbhatt@xxxxxxxxxxxxxx Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/bus/mhi/core/init.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -544,6 +544,7 @@ void mhi_deinit_chan_ctxt(struct mhi_con struct mhi_ring *buf_ring; struct mhi_ring *tre_ring; struct mhi_chan_ctxt *chan_ctxt; + u32 tmp; buf_ring = &mhi_chan->buf_ring; tre_ring = &mhi_chan->tre_ring; @@ -554,7 +555,19 @@ void mhi_deinit_chan_ctxt(struct mhi_con vfree(buf_ring->base); buf_ring->base = tre_ring->base = NULL; + tre_ring->ctxt_wp = NULL; chan_ctxt->rbase = 0; + chan_ctxt->rlen = 0; + chan_ctxt->rp = 0; + chan_ctxt->wp = 0; + + tmp = chan_ctxt->chcfg; + tmp &= ~CHAN_CTX_CHSTATE_MASK; + tmp |= (MHI_CH_STATE_DISABLED << CHAN_CTX_CHSTATE_SHIFT); + chan_ctxt->chcfg = tmp; + + /* Update to all cores */ + smp_wmb(); } int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl, Patches currently in stable-queue which might be from bbhatt@xxxxxxxxxxxxxx are queue-5.10/bus-mhi-core-clear-configuration-from-channel-context-during-reset.patch