linux-kernel - [PATCH] mmc: atmel-mci: fix deadlock

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Date:	Wed,  9 May 2012 11:23:36 +0200
From:	Steffen Kühn <sk@...onit.com>
To:	Ludovic Desroches <ludovic.desroches@...el.com>,
	Chris Ball <cjb@...top.org>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Steffen Kühn <sk@...onit.com>
Subject: [PATCH] mmc: atmel-mci: fix deadlock

solves a deadlock problem which appears when a mmc card is
removing and a process is reading from the card at the same time.
---
 drivers/mmc/host/atmel-mci.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index e94476b..effdc36 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1499,8 +1499,10 @@ static void atmci_tasklet_func(unsigned long priv)
			}

			if (!atmci_test_and_clear_pending(host,
-						EVENT_XFER_COMPLETE))
+						EVENT_XFER_COMPLETE)) {
+				host->stop_transfer(host);
				break;
+            }

			atmci_set_completed(host, EVENT_XFER_COMPLETE);
			prev_state = state = STATE_DATA_BUSY;
--
1.7.2.5
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