linux-kernel - Re: [PATCH v2] mmc: sdhci-msm: fix mutex while in spinlock

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Date:   Tue, 2 Jul 2019 10:07:34 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        agross@...nel.org, ulf.hansson@...aro.org
Cc:     bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        khasim.mohammed@...aro.org, vinod.koul@...aro.org
Subject: Re: [PATCH v2] mmc: sdhci-msm: fix mutex while in spinlock

On 1/07/19 6:01 PM, Jorge Ramirez-Ortiz wrote:
> mutexes can sleep and therefore should not be taken while holding a
> spinlock. move clk_get_rate (can sleep) outside the spinlock protected
> region.
> 
> Fixes: 83736352e0ca ("mmc: sdhci-msm: Update DLL reset sequence")
> Cc: stable@...r.kernel.org
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-msm.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 5fc76a1993d0..9cf14b359c14 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -575,11 +575,14 @@ static int msm_init_cm_dll(struct sdhci_host *host)
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>  	int wait_cnt = 50;
> -	unsigned long flags;
> +	unsigned long flags, xo_clk = 0;
>  	u32 config;
>  	const struct sdhci_msm_offset *msm_offset =
>  					msm_host->offset;
>  
> +	if (msm_host->use_14lpp_dll_reset && !IS_ERR_OR_NULL(msm_host->xo_clk))
> +		xo_clk = clk_get_rate(msm_host->xo_clk);
> +
>  	spin_lock_irqsave(&host->lock, flags);
>  
>  	/*
> @@ -627,10 +630,10 @@ static int msm_init_cm_dll(struct sdhci_host *host)
>  		config &= CORE_FLL_CYCLE_CNT;
>  		if (config)
>  			mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock * 8),
> -					clk_get_rate(msm_host->xo_clk));
> +					xo_clk);
>  		else
>  			mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock * 4),
> -					clk_get_rate(msm_host->xo_clk));
> +					xo_clk);
>  
>  		config = readl_relaxed(host->ioaddr +
>  				msm_offset->core_dll_config_2);
>