On Tue, Nov 14, 2023 at 01:27:41PM +0800, Qiang Yu wrote:
> From: Hemant Kumar <quic_hemantk@xxxxxxxxxxx>
>
> If CONFIG_TRACE_IRQFLAGS is enabled, irq will be enabled once __local_bh_
> enable_ip is called as part of write_unlock_bh. Hence, let's take irqsave
"__local_bh_enable_ip" is a function name, so you should not break it.
> lock after TRE is generated to avoid running write_unlock_bh when irqsave
> lock is held.
>
I still don't understand this commit message. Where is the write_unlock_bh()
being called?
- Mani
> Signed-off-by: Hemant Kumar <quic_hemantk@xxxxxxxxxxx>
> Signed-off-by: Lazarus Motha <quic_lmotha@xxxxxxxxxxx>
> Signed-off-by: Qiang Yu <quic_qianyu@xxxxxxxxxxx>
> ---
> drivers/bus/mhi/host/main.c | 13 +++++--------
> 1 file changed, 5 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
> index 33f27e2..d7abd0b 100644
> --- a/drivers/bus/mhi/host/main.c
> +++ b/drivers/bus/mhi/host/main.c
> @@ -1128,17 +1128,15 @@ static int mhi_queue(struct mhi_device *mhi_dev, struct mhi_buf_info *buf_info,
> if (unlikely(MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)))
> return -EIO;
>
> - read_lock_irqsave(&mhi_cntrl->pm_lock, flags);
> -
> ret = mhi_is_ring_full(mhi_cntrl, tre_ring);
> - if (unlikely(ret)) {
> - ret = -EAGAIN;
> - goto exit_unlock;
> - }
> + if (unlikely(ret))
> + return -EAGAIN;
>
> ret = mhi_gen_tre(mhi_cntrl, mhi_chan, buf_info, mflags);
> if (unlikely(ret))
> - goto exit_unlock;
> + return ret;
> +
> + read_lock_irqsave(&mhi_cntrl->pm_lock, flags);
>
> /* Packet is queued, take a usage ref to exit M3 if necessary
> * for host->device buffer, balanced put is done on buffer completion
> @@ -1158,7 +1156,6 @@ static int mhi_queue(struct mhi_device *mhi_dev, struct mhi_buf_info *buf_info,
> if (dir == DMA_FROM_DEVICE)
> mhi_cntrl->runtime_put(mhi_cntrl);
>
> -exit_unlock:
> read_unlock_irqrestore(&mhi_cntrl->pm_lock, flags);
>
> return ret;
> --
> 2.7.4
>
>
--
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