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bus: mhi: core: Clear configuration from channel context during reset

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commit 47705c0846 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.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bhaumik Bhatt 2021-04-01 14:16:15 -07:00 • committed by Greg Kroah-Hartman
commit bcb80329e8
1 changed files with 13 additions and 0 deletions
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13
drivers/bus/mhi/core/init.c
View file

@ -544,6 +544,7 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
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_controller *mhi_cntrl,
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,