* [PATCH v2] mhi: Fix double dma free
@ 2021-02-09 18:11 Loic Poulain
2021-02-10 8:14 ` Manivannan Sadhasivam
2021-03-01 19:59 ` patchwork-bot+linux-arm-msm
0 siblings, 2 replies; 3+ messages in thread
From: Loic Poulain @ 2021-02-09 18:11 UTC (permalink / raw)
To: manivannan.sadhasivam, hemantk; +Cc: linux-arm-msm, kvalo, Loic Poulain
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.
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>
---
v2: add Fixes tag
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 aa575d3..be4eebb 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);
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] mhi: Fix double dma free
2021-02-09 18:11 [PATCH v2] mhi: Fix double dma free Loic Poulain
@ 2021-02-10 8:14 ` Manivannan Sadhasivam
2021-03-01 19:59 ` patchwork-bot+linux-arm-msm
1 sibling, 0 replies; 3+ messages in thread
From: Manivannan Sadhasivam @ 2021-02-10 8:14 UTC (permalink / raw)
To: Loic Poulain; +Cc: hemantk, linux-arm-msm, kvalo
On Tue, Feb 09, 2021 at 07:11:04PM +0100, Loic Poulain wrote:
> 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.
>
> 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>
Thanks,
Mani
> ---
> v2: add Fixes tag
>
> 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 aa575d3..be4eebb 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);
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] mhi: Fix double dma free
2021-02-09 18:11 [PATCH v2] mhi: Fix double dma free Loic Poulain
2021-02-10 8:14 ` Manivannan Sadhasivam
@ 2021-03-01 19:59 ` patchwork-bot+linux-arm-msm
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+linux-arm-msm @ 2021-03-01 19:59 UTC (permalink / raw)
To: Loic Poulain; +Cc: linux-arm-msm
Hello:
This patch was applied to qcom/linux.git (refs/heads/for-next):
On Tue, 9 Feb 2021 19:11:04 +0100 you wrote:
> 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()
>
> [...]
Here is the summary with links:
- [v2] mhi: Fix double dma free
https://git.kernel.org/qcom/c/db4e8de1935b
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-02-09 18:11 [PATCH v2] mhi: Fix double dma free Loic Poulain
2021-02-10 8:14 ` Manivannan Sadhasivam
2021-03-01 19:59 ` patchwork-bot+linux-arm-msm
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