This is a note to let you know that I've just added the patch titled
tmio_mmc: don't clear unhandled pending interrupts
to the 2.6.35-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tmio_mmc-don-t-clear-unhandled-pending-interrupts.patch
and it can be found in the queue-2.6.35 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@kernel.org> know about it.
>From b78d6c5f51935ba89df8db33a57bacb547aa7325 Mon Sep 17 00:00:00 2001
From: Yusuke Goda <yusuke.goda...@renesas.com>
Date: Thu, 9 Sep 2010 16:37:39 -0700
Subject: tmio_mmc: don't clear unhandled pending interrupts
From: Yusuke Goda <yusuke.goda...@renesas.com>
commit b78d6c5f51935ba89df8db33a57bacb547aa7325 upstream.
Previously, it was possible for ack_mmc_irqs() to clear pending interrupt
bits in the CTL_STATUS register, even though the interrupt handler had not
been called. This was because of a race that existed when doing a
read-modify-write sequence on CTL_STATUS. After the read step in this
sequence, if an interrupt occurred (causing one of the bits in CTL_STATUS
to be set) the write step would inadvertently clear it.
Observed with the TMIO_STAT_RXRDY bit together with CMD53 on AR6002 and
BCM4318 SDIO cards in polled mode.
This patch eliminates this race by only writing to CTL_STATUS and clearing
the interrupts that were passed as an argument to ack_mmc_irqs()."
[m...@console-pimps.org: rewrote changelog]
Signed-off-by: Yusuke Goda <yusuke.goda...@renesas.com>
Acked-by: Magnus Damm <d...@opensource.se>"
Tested-by: Arnd Hannemann <a...@arndnet.de>"
Acked-by: Ian Molton <i...@mnementh.co.uk>
Cc: Matt Fleming <m...@console-pimps.org>
Cc: Samuel Ortiz <sa...@linux.intel.com>
Cc: Paul Mundt <let...@linux-sh.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
drivers/mmc/host/tmio_mmc.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -82,10 +82,7 @@
#define ack_mmc_irqs(host, i) \
do { \
- u32 mask;\
- mask = sd_ctrl_read32((host), CTL_STATUS); \
- mask &= ~((i) & TMIO_MASK_IRQ); \
- sd_ctrl_write32((host), CTL_STATUS, mask); \
+ sd_ctrl_write32((host), CTL_STATUS, ~(i)); \
} while (0)
Patches currently in stable-queue which might be from
yusuke.goda...@renesas.com are
queue-2.6.35/tmio_mmc-don-t-clear-unhandled-pending-interrupts.patch
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