linux-kernel - [PATCH 4.19 259/271] mmc: sdhci-msm: fix mutex while in spinlock

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Message-Id: <20190724191717.395301959@linuxfoundation.org>
Date:   Wed, 24 Jul 2019 21:22:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.19 259/271] mmc: sdhci-msm: fix mutex while in spinlock

From: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>

commit 5e6b6651d22de109ebf48ca00d0373bc2c0cc080 upstream.

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>
Reviewed-by: Vinod Koul <vkoul@...nel.org>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/sdhci-msm.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -582,11 +582,14 @@ static int msm_init_cm_dll(struct sdhci_
 	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);
 
 	/*
@@ -634,10 +637,10 @@ static int msm_init_cm_dll(struct sdhci_
 		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);