linux-kernel - [PATCH] mmc: sdhci: Do not allow tuning procedure to be interrupted

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Message-Id: <1469197051-18733-1-git-send-email-robert.foss@collabora.com>
Date:	Fri, 22 Jul 2016 10:17:31 -0400
From:	robert.foss@...labora.com
To:	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	aisheng.dong@...escale.com, suneel.garapati@...inx.com,
	wenkai.du@...el.com, johan.derycke@...co.com,
	ludovic.desroches@...el.com, haibo.chen@...escale.com,
	ivan.ivanov@...aro.org, ulf.hansson@...aro.org
Cc:	enric.balletbo@...labora.com, tomeu.vizoso@...labora.com,
	Christopher Freeman <cfreeman@...dia.com>
Subject: [PATCH] mmc: sdhci: Do not allow tuning procedure to be interrupted

From: Christopher Freeman <cfreeman@...dia.com>

wait_event_interruptible_timeout() will return early if the blocked
process receives a signal, causing the driver to abort the tuning
procedure and possibly leaving the controller in a bad state.  Since the
tuning command is expected to complete quickly (<50ms) and we've set a
timeout, use wait_event_timeout() instead.

Signed-off-by: Christopher Freeman <cfreeman@...dia.com>
---
 drivers/mmc/host/sdhci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ef3eee7..2029090 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2009,7 +2009,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
 
 		spin_unlock_irqrestore(&host->lock, flags);
 		/* Wait for Buffer Read Ready interrupt */
-		wait_event_interruptible_timeout(host->buf_ready_int,
+		wait_event_timeout(host->buf_ready_int,
 					(host->tuning_done == 1),
 					msecs_to_jiffies(50));
 		spin_lock_irqsave(&host->lock, flags);
-- 
2.7.4