linux-kernel - Re: [PATCH] bus: mhi: core: Use current ee in intvec handler

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Message-ID: <aab020af0372b11ff63ba4526aab0fdc@codeaurora.org>
Date:   Fri, 15 May 2020 19:58:39 -0700
From:   bbhatt@...eaurora.org
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     manivannan.sadhasivam@...aro.org, hemantk@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-owner@...r.kernel.org
Subject: Re: [PATCH] bus: mhi: core: Use current ee in intvec handler

On 2020-05-14 19:17, Jeffrey Hugo wrote:
> The intvec handler stores the caches ee in a local variable for use in
> processing the intvec.  It should instead use the current ee which is
> read at the beginning of the intvec incase that the intvec is related 
> to
> an ee change.  Otherwise, the handler might make the wrong decision
> based on an incorrect ee.
> 
> Fixes: 3000f85b8f47 (bus: mhi: core: Add support for basic PM 
> operations)
> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
> ---
>  drivers/bus/mhi/core/main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> index 7272a5a..0a41fe5 100644
> --- a/drivers/bus/mhi/core/main.c
> +++ b/drivers/bus/mhi/core/main.c
> @@ -386,8 +386,8 @@ irqreturn_t mhi_intvec_threaded_handler(int
> irq_number, void *dev)
>  	write_lock_irq(&mhi_cntrl->pm_lock);
>  	if (MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) {
>  		state = mhi_get_mhi_state(mhi_cntrl);
> -		ee = mhi_cntrl->ee;
>  		mhi_cntrl->ee = mhi_get_exec_env(mhi_cntrl);
> +		ee = mhi_cntrl->ee;
>  	}
> 
>  	if (state == MHI_STATE_SYS_ERR) {
Hi Jeff,

Let's hold off on this change for now please as we have some good set of
bug fixes and improvements coming in very soon. They're only pending 
post
to LKML.

Thanks