linux-kernel - Re: [PATCH] dmaengine: bam_dma: fix return of bam_dma

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Date:   Fri, 11 Dec 2020 19:48:41 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Parth Y Shah <sparth1292@...il.com>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        dan.j.williams@...el.com, linux-arm-msm@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: bam_dma: fix return of bam_dma_irq()

On 07-12-20, 12:03, Parth Y Shah wrote:
> While performing suspend/resume, we were getting below kernel crash.
> 
> [   54.541672] [FTS][Info]gesture suspend...
> [   54.605256] [FTS][Error][GESTURE]Enter into gesture(suspend) failed!
> [   54.605256]
> [   58.345850] irq event 10: bogus return value fffffff3
> ......
> 
> [   58.345966] [<ffff0000080830f0>] el1_irq+0xb0/0x124
> [   58.345971] [<ffff000008085360>] arch_cpu_idle+0x10/0x18
> [   58.345975] [<ffff0000081077f4>] do_idle+0x1ac/0x1e0
> [   58.345979] [<ffff0000081079c8>] cpu_startup_entry+0x20/0x28
> [   58.345983] [<ffff000008a80ed0>] rest_init+0xd0/0xdc
> [   58.345988] [<ffff0000091c0b48>] start_kernel+0x390/0x3a4
> [   58.345990] handlers:
> [   58.345994] [<ffff0000085120d0>] bam_dma_irq
> 
> The reason for the crash we found is, bam_dma_irq() was returning
> negative value when the device resumes in some conditions.
> 
> In addition, the irq handler should have one of the below return values.
> 
> IRQ_NONE            interrupt was not from this device or was not handled
> IRQ_HANDLED         interrupt was handled by this device
> IRQ_WAKE_THREAD     handler requests to wake the handler thread
> 
> Therefore, to resolve this crash, we have changed the return value to
> IRQ_NONE.

Applied, thanks

-- 
~Vinod