The patch titled
tmio_mmc: don't clear unhandled pending interrupts
has been added to the -mm tree. Its filename is
tmio_mmc-dont-clear-unhandled-pending-interrupts.patch
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See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: tmio_mmc: don't clear unhandled pending interrupts
From: Yusuke Goda <[email protected]>
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.
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()."
[[email protected]: rewrote changelog]
Signed-off-by: Yusuke Goda <[email protected]>
Cc: Magnus Damm <[email protected]>
Cc: Matt Fleming <[email protected]>
Cc: Ian Molton <[email protected]>
Cc: Samuel Ortiz <[email protected]>
Cc: Paul Mundt <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/mmc/host/tmio_mmc.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff -puN
drivers/mmc/host/tmio_mmc.h~tmio_mmc-dont-clear-unhandled-pending-interrupts
drivers/mmc/host/tmio_mmc.h
---
a/drivers/mmc/host/tmio_mmc.h~tmio_mmc-dont-clear-unhandled-pending-interrupts
+++ a/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 -mm which might be from [email protected] are
tmio_mmc-dont-clear-unhandled-pending-interrupts.patch
tmio_mmc-revise-a-limit-of-the-data-size.patch
tmio_mmc-revise-a-limit-of-the-data-size-fix.patch
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