From: Bhaumik Bhatt bbhatt@codeaurora.org
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@codeaurora.org Reviewed-by: Hemant Kumar hemantk@codeaurora.org Reviewed-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Link: https://lore.kernel.org/r/1617311778-1254-7-git-send-email-bbhatt@codeaurora... Signed-off-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 @@ -547,6 +547,7 @@ 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; @@ -560,7 +561,19 @@ 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,