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| author | Loic Poulain <loic.poulain@linaro.org> | 2021-02-10 09:25:38 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-10 09:37:07 +0100 |
| commit | db4e8de1935b0202960e9ebb88ab93e8bd1e66b1 (patch) | |
| tree | 34f1a813f3e364159a7536da215c6428a15df044 /drivers/bus | |
| parent | uapi: map_to_7segment: Update example in documentation (diff) | |
| download | linux-db4e8de1935b0202960e9ebb88ab93e8bd1e66b1.tar.xz linux-db4e8de1935b0202960e9ebb88ab93e8bd1e66b1.zip | |
mhi: Fix double dma free
mhi_deinit_chan_ctxt functionthat takes care of unitializing channel
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
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.
Link: https://lore.kernel.org/r/1612894264-15956-1-git-send-email-loic.poulain@linaro.org
Fixes: a7f422f2f89e ("bus: mhi: Fix channel close issue on driver remove")
Reported-by: Kalle Valo <kvalo@codeaurora.org>
Tested-by: Kalle Valo <kvalo@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210210082538.2494-2-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/mhi/core/init.c | 3 |
1 files changed, 3 insertions, 0 deletions
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); |