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From: dragos.tatulea@intel.com
To: linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, cjb@laptop.org
Cc: kirill.shutemov@linux.intel.com, irina.tirdea@intel.com,
	octavian.purdila@intel.com, tony.luck@intel.com,
	keescook@chromium.org, dragos.tatulea@gmail.com,
	Adrian Hunter <adrian.hunter@intel.com>
Subject: [PATCH v2 14/26] mmc: panic write: bypass bus ref locking
Date: Thu,  8 Nov 2012 15:06:12 +0200	[thread overview]
Message-ID: <1352379984-18381-15-git-send-email-dragos.tatulea@intel.com> (raw)
In-Reply-To: <1352379984-18381-1-git-send-email-dragos.tatulea@intel.com>

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

We want to avoid it while panic dumping.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
---
 drivers/mmc/core/core.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 4fd7061..3daec19 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1418,6 +1418,11 @@ static inline void mmc_bus_get(struct mmc_host *host)
 {
 	unsigned long flags;
 
+	if (mmc_am_panic_task(host)) {
+		host->bus_refs++;
+		return;
+	}
+
 	spin_lock_irqsave(&host->lock, flags);
 	host->bus_refs++;
 	spin_unlock_irqrestore(&host->lock, flags);
@@ -1431,6 +1436,11 @@ static inline void mmc_bus_put(struct mmc_host *host)
 {
 	unsigned long flags;
 
+	if (mmc_am_panic_task(host)) {
+		host->bus_refs--;
+		return;
+	}
+
 	spin_lock_irqsave(&host->lock, flags);
 	host->bus_refs--;
 	if ((host->bus_refs == 0) && host->bus_ops)
-- 
1.7.9.5


  parent reply	other threads:[~2012-11-08 13:04 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-08 13:05 [PATCH v2 00/26] pstore, mmc: add mmc as backend for pstore dragos.tatulea
2012-11-08 13:05 ` [PATCH v2 01/26] pstore: allow for big files dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 02/26] pstore: add flags dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 03/26] pstore: add flush dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 04/26] blkoops: add a block device oops / panic logger dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 05/26] block: add panic write dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 06/26] mmc: block: add panic write support dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 07/26] mmc: panic write: bypass host claiming dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 08/26] mmc: panic write: bypass request completion dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 09/26] mmc: panic write: suppress host not claimed warnings dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 10/26] mmc: panic write: do not msleep dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 11/26] mmc: panic write: bypass clock gating dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 12/26] mmc: panic write: bypass regulators dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 13/26] mmc: panic write: trap non panic tasks dragos.tatulea
2012-11-08 13:06 ` dragos.tatulea [this message]
2012-11-08 13:06 ` [PATCH v2 15/26] mmc: sdhci: panic write: bypass spin lock dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 16/26] mmc: sdhci: panic write: no sleeping dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 17/26] mmc: sdhci: panic write: call tasklets inline dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 18/26] mmc: sdhci: panic write: no timeout timer dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 19/26] mmc: sdhci: panic write: no runtime pm dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 20/26] mmc: sdhci: panic write: no tuning dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 21/26] mmc: sdhci: panic write: poll interrupts dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 22/26] mmc: sdhci: panic write: no dma mapping dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 23/26] mmc: sdhci: panic write: resume suspended host dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 24/26] mmc: sdhci: panic write: abort request in progress dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 25/26] mmc: sdhci: panic write: trap nonpanic tasks dragos.tatulea
2012-11-08 13:06 ` [PATCH v2 26/26] mmc: sdhci-pci: add panic write support dragos.tatulea

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