The patch titled
mmc: fix hang if card was removed during suspend and unsafe resume was
enabled
has been added to the -mm tree. Its filename is
mmc-fix-hang-if-card-was-removed-during-suspend-and-unsafe-resume-was-enabled.patch
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------------------------------------------------------
Subject: mmc: fix hang if card was removed during suspend and unsafe resume was
enabled
From: Maxim Levitsky <maximlevit...@gmail.com>
Currently removal of the card leads to del_disk called indirectly by mmc
core. This function expects userspace to be running, which isn't when
.resume is called
Fix that by removing the code that did that in mmc_resume_host. It is
possible because card detection logic will kick it later and remove the
card.
Also make mtd workqueue freezeable, so it won't attempt to add/remove the
card while userspace is frozen.
Signed-off-by: Maxim Levitsky <maximlevit...@gmail.com>
Cc: "Rafael J. Wysocki" <r...@sisk.pl>
Cc: David Woodhouse <dw...@infradead.org>
Cc: Jorg Schummer <ext-jorg.2.schum...@nokia.com>
Cc: <linux-mmc@vger.kernel.org>
Cc: <sta...@kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
drivers/mmc/core/core.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff -puN
drivers/mmc/core/core.c~mmc-fix-hang-if-card-was-removed-during-suspend-and-unsafe-resume-was-enabled
drivers/mmc/core/core.c
---
a/drivers/mmc/core/core.c~mmc-fix-hang-if-card-was-removed-during-suspend-and-unsafe-resume-was-enabled
+++ a/drivers/mmc/core/core.c
@@ -1257,7 +1257,6 @@ int mmc_suspend_host(struct mmc_host *ho
if (host->caps & MMC_CAP_DISABLE)
cancel_delayed_work(&host->disable);
cancel_delayed_work(&host->detect);
- mmc_flush_scheduled_work();
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
@@ -1300,15 +1299,11 @@ int mmc_resume_host(struct mmc_host *hos
mmc_select_voltage(host, host->ocr);
BUG_ON(!host->bus_ops->resume);
err = host->bus_ops->resume(host);
+
if (err) {
printk(KERN_WARNING "%s: error %d during resume "
"(card was removed?)\n",
mmc_hostname(host), err);
- if (host->bus_ops->remove)
- host->bus_ops->remove(host);
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_release_host(host);
/* no need to bother upper layers */
err = 0;
}
@@ -1332,7 +1327,7 @@ static int __init mmc_init(void)
{
int ret;
- workqueue = create_singlethread_workqueue("kmmcd");
+ workqueue = create_freezeable_workqueue("kmmcd");
if (!workqueue)
return -ENOMEM;
_
Patches currently in -mm which might be from maximlevit...@gmail.com are
mmc-fix-hang-if-card-was-removed-during-suspend-and-unsafe-resume-was-enabled.patch
linux-next.patch
mm-pm-force-gfp_noio-during-suspend-hibernation-and-resume.patch
ricoh_mmc-port-from-driver-to-pci-quirk.patch
ricoh_mmc-port-from-driver-to-pci-quirk-update.patch
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