[v2] mmc: sdhci-msm: fix mutex while in spinlock
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Message ID 20190701150125.2602-1-jorge.ramirez-ortiz@linaro.org
State New
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Series
  • [v2] mmc: sdhci-msm: fix mutex while in spinlock
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Commit Message

Jorge Ramirez-Ortiz July 1, 2019, 3:01 p.m. UTC
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@vger.kernel.org
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/mmc/host/sdhci-msm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

Comments

Vinod Koul July 1, 2019, 3:22 p.m. UTC | #1
On 01-07-19, 17:01, 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.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Adrian Hunter July 2, 2019, 7:07 a.m. UTC | #2
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@vger.kernel.org
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Acked-by: Adrian Hunter <adrian.hunter@intel.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);
>
Ulf Hansson July 8, 2019, 11:55 a.m. UTC | #3
On Mon, 1 Jul 2019 at 17:01, Jorge Ramirez-Ortiz
<jorge.ramirez-ortiz@linaro.org> 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@vger.kernel.org
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  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);
> --
> 2.21.0
>

Patch
diff mbox series

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);