The patch titled
omap_hsmmc: prevent races with irq handler
has been added to the -mm tree. Its filename is
omap_hsmmc-prevent-races-with-irq-handler.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: omap_hsmmc: prevent races with irq handler
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
If an unexpected interrupt occurs while preparing the next request, an
oops can occur.
For example, a new request is setting up DMA for data transfer so
host->data is not NULL. An unexpected transfer complete (TC) interrupt
comes along and the interrupt handler sets host->data to NULL. Oops!
Prevent that by disabling interrupts while setting up a new request.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Cc: Ian Molton <ian@xxxxxxxxxxxxxx>
Cc: "Roberto A. Foglietta" <roberto.foglietta@xxxxxxxxx>
Cc: Jarkko Lavinen <jarkko.lavinen@xxxxxxxxx>
Cc: Denis Karpov <ext-denis.2.karpov@xxxxxxxxx>
Cc: Pierre Ossman <pierre@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/omap_hsmmc.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff -puN drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-prevent-races-with-irq-handler drivers/mmc/host/omap_hsmmc.c
--- a/drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-prevent-races-with-irq-handler
+++ a/drivers/mmc/host/omap_hsmmc.c
@@ -459,6 +459,13 @@ mmc_omap_start_command(struct mmc_omap_h
if (host->use_dma)
cmdreg |= DMA_EN;
+ /*
+ * In an interrupt context (i.e. STOP command), the interrupt is already
+ * enabled, otherwise it is not (i.e. new request).
+ */
+ if (!in_interrupt())
+ enable_irq(host->irq);
+
OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
}
@@ -1018,6 +1025,13 @@ static void omap_mmc_request(struct mmc_
struct mmc_omap_host *host = mmc_priv(mmc);
int err;
+ /*
+ * Prevent races with the interrupt handler because of unexpected
+ * interrupts, but not if we are already in interrupt context i.e.
+ * retries.
+ */
+ if (!in_interrupt())
+ disable_irq(host->irq);
WARN_ON(host->mrq != NULL);
host->mrq = req;
err = mmc_omap_prepare_data(host, req);
@@ -1026,6 +1040,8 @@ static void omap_mmc_request(struct mmc_
if (req->data)
req->data->error = err;
host->mrq = NULL;
+ if (!in_interrupt())
+ enable_irq(host->irq);
mmc_request_done(mmc, req);
return;
}
_
Patches currently in -mm which might be from adrian.hunter@xxxxxxxxx are
mmc-register-mmci-omap-hs-using-platform_driver_probe.patch
mmc-add-enable-and-disable-methods-to-mmc-host.patch
mmc-allow-host-claim-release-nesting.patch
mmc-add-mmc_cap_nonremovable-host-capability.patch
mmc-add-ability-to-save-power-by-powering-off-cards.patch
mmc-add-mmc-card-sleep-and-awake-support.patch
mmc-power-off-once-at-removal.patch
mmc-add-host-capabilities-for-sd-only-and-mmc-only.patch
mmc-check-status-after-mmc-switch-command.patch
omap_hsmmc-add-debugfs-entry-host-registers.patch
omap_hsmmc-make-use-of-new-enable-disable-interface.patch
arm-omap-mmc-twl4030-add-context-loss-counter-support.patch
omap_hsmmc-keep-track-of-power-mode.patch
omap_hsmmc-context-save-restore-support.patch
omap_hsmmc-set-open-drain-bit-correctly.patch
omap_hsmmc-ensure-workqueues-are-empty-before-suspend.patch
omap_hsmmc-fix-scatter-gather-list-sanity-checking.patch
omap_hsmmc-make-use-of-new-mmc_cap_nonremovable-host-capability.patch
omap_hsmmc-support-for-deeper-power-saving-states.patch
arm-omap-mmc-twl4030-add-regulator-sleep-wake-function.patch
omap_hsmmc-put-mmc-regulator-to-sleep.patch
omap_hsmmc-add-mmc-card-sleep-and-awake-support.patch
omap_hsmmc-fix-null-pointer-dereference.patch
omap_hsmmc-cleanup-macro-usage.patch
omap_hsmmc-clear-interrupt-status-after-init-sequence.patch
omap_hsmmc-cater-for-weird-cmd6-behaviour.patch
omap_hsmmc-prevent-races-with-irq-handler.patch
omap_hsmmc-pass-host-capabilities-for-sd-only-and-mmc-only.patch
omap_hsmmc-code-refactoring.patch
omap_hsmmc-protect-the-card-when-the-cover-is-open.patch
omap_hsmmc-ensure-all-clock-enables-and-disables-are-paired.patch
omap_hsmmc-set-a-large-data-timeout-for-commands-with-busy-signal.patch
arm-omap-rx51-set-mmc-capabilities-and-power-saving-flag.patch
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