linux-kernel - [PATCH 07/26] mmc: panic write: bypass host claiming

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Message-Id: <1351000104-13015-8-git-send-email-irina.tirdea@intel.com>
Date:	Tue, 23 Oct 2012 16:48:05 +0300
From:	Irina Tirdea <irina.tirdea@...el.com>
To:	Anton Vorontsov <cbouatmailru@...il.com>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>, Chris Ball <cjb@...top.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Octavian Purdila <octavian.purdila@...el.com>,
	Irina Tirdea <irina.tirdea@...el.com>
Subject: [PATCH 07/26] mmc: panic write: bypass host claiming

From: Adrian Hunter <adrian.hunter@...el.com>

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
---
 drivers/mmc/core/core.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 06c42cf..dbe5332 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -767,6 +767,9 @@ int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
 	unsigned long flags;
 	int stop;
 
+	if (mmc_am_panic_task(host))
+		return 0;
+
 	might_sleep();
 
 	add_wait_queue(&host->wq, &wait);
@@ -807,6 +810,9 @@ int mmc_try_claim_host(struct mmc_host *host)
 	int claimed_host = 0;
 	unsigned long flags;
 
+	if (mmc_am_panic_task(host))
+		return 1;
+
 	spin_lock_irqsave(&host->lock, flags);
 	if (!host->claimed || host->claimer == current) {
 		host->claimed = 1;
@@ -837,6 +843,9 @@ void mmc_release_host(struct mmc_host *host)
 	if (host->ops->disable && host->claim_cnt == 1)
 		host->ops->disable(host);
 
+	if (mmc_am_panic_task(host))
+		return;
+
 	spin_lock_irqsave(&host->lock, flags);
 	if (--host->claim_cnt) {
 		/* Release for nested claim */
-- 
1.7.9.5

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