| Message ID | 20210210082538.2494-2-manivannan.sadhasivam@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | MHI fix for v5.12 | expand |
On 2021-02-10 12:25 AM, Manivannan Sadhasivam wrote: > From: Loic Poulain <loic.poulain@linaro.org> > > mhi_deinit_chan_ctxt functionthat takes care of unitializing channel s/functionthat/function that, uninitializing > resources, including unmapping coherent MHI areas, can be called > from different path in case of controller unregistering/removal: > - From a client driver remove callback, via mhi_unprepare_channel > - From mhi_driver_remove that unitialize all channels uninitialize > > mhi_driver_remove() > |-> driver->remove() > | |-> mhi_unprepare_channel() > | |-> mhi_deinit_chan_ctxt() > |... > |-> mhi_deinit_chan_ctxt() > > This leads to double dma freeing... > > Fix that by preventing deinit for already uninitialized channel. > > Fixes: a7f422f2f89e ("bus: mhi: Fix channel close issue on driver > remove") > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reported-by: Kalle Valo <kvalo@codeaurora.org> > Tested-by: Kalle Valo <kvalo@codeaurora.org> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > Link: > https://lore.kernel.org/r/1612894264-15956-1-git-send-email-loic.poulain@linaro.org > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > --- > drivers/bus/mhi/core/init.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index aa575d3fb3ae..be4eebb0971b 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -557,6 +557,9 @@ void mhi_deinit_chan_ctxt(struct mhi_controller > *mhi_cntrl, > tre_ring = &mhi_chan->tre_ring; > chan_ctxt = &mhi_cntrl->mhi_ctxt->chan_ctxt[mhi_chan->chan]; > > + if (!chan_ctxt->rbase) /* Already uninitialized */ > + return; > + > mhi_free_coherent(mhi_cntrl, tre_ring->alloc_size, > tre_ring->pre_aligned, tre_ring->dma_handle); > vfree(buf_ring->base); As mentioned in my previous email, I see some improvements can be made to the commit message and title of this patch. Highlighted those above. Please update title to "bus: mhi: core: Fix double DMA free from mhi_deinit_chan_ctxt()". Thanks, Bhaumik --- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index aa575d3fb3ae..be4eebb0971b 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -557,6 +557,9 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl, tre_ring = &mhi_chan->tre_ring; chan_ctxt = &mhi_cntrl->mhi_ctxt->chan_ctxt[mhi_chan->chan]; + if (!chan_ctxt->rbase) /* Already uninitialized */ + return; + mhi_free_coherent(mhi_cntrl, tre_ring->alloc_size, tre_ring->pre_aligned, tre_ring->dma_handle); vfree(buf_ring->base);