linux-kernel - Re: [PATCH 3/5] scsi: ufs: pltfrm: Disable runtime PM during removal of glue drivers

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Message-ID: <7c8a5b9fe2baa1e716754e7a577be2c7bf12c539.camel@mediatek.com>
Date: Tue, 12 Nov 2024 02:15:01 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
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Subject: Re: [PATCH 3/5] scsi: ufs: pltfrm: Disable runtime PM during removal
 of glue drivers

On Mon, 2024-11-11 at 23:18 +0530, Manivannan Sadhasivam via B4 Relay
wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> When the UFSHCD platform glue drivers are removed, runtime PM should
> be
> disabled using pm_runtime_disable() to balance the enablement done in
> ufshcd_pltfrm_init(). This is also reported by PM core when the glue
> driver
> is removed and inserted again:
> 
> ufshcd-qcom 1d84000.ufshc: Unbalanced pm_runtime_enable!
> 
> So disable runtime PM using a new helper API ufshcd_pltfrm_remove(),
> that
> also takes care of removing ufshcd. This helper should be called
> during the
> remove() stage of glue drivers.
> 
> Cc: stable@...r.kernel.org # 3.12
> Fixes: 62694735ca95 ("[SCSI] ufs: Add runtime PM support for UFS host
> controller driver")
> Signed-off-by: Manivannan Sadhasivam <
> manivannan.sadhasivam@...aro.org>
> ---
>  drivers/ufs/host/cdns-pltfrm.c        |  4 +---
>  drivers/ufs/host/tc-dwc-g210-pltfrm.c |  4 +---
>  drivers/ufs/host/ufs-exynos.c         |  2 +-
>  drivers/ufs/host/ufs-hisi.c           |  4 +---
>  drivers/ufs/host/ufs-mediatek.c       |  4 +---
>  drivers/ufs/host/ufs-qcom.c           |  2 +-
>  drivers/ufs/host/ufs-renesas.c        |  4 +---
>  drivers/ufs/host/ufs-sprd.c           |  4 +---
>  drivers/ufs/host/ufshcd-pltfrm.c      | 13 +++++++++++++
>  drivers/ufs/host/ufshcd-pltfrm.h      |  1 +
>  10 files changed, 22 insertions(+), 20 deletions(-)
> 
> 

Reviewed-by: Peter Wang <peter.wang@...iatek.com>