The patch titled
mmc: fix all hangs related to mmc/sd card insert/removal during
suspend/resume
has been added to the -mm tree. Its filename is
mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume.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: mmc: fix all hangs related to mmc/sd card insert/removal during
suspend/resume
From: Maxim Levitsky <maximlevit...@gmail.com>
Signed-off-by: Maxim Levitsky <maximlevit...@gmail.com>
Cc: David Brownell <davi...@pacbell.net>
Cc: Alan Stern <st...@rowland.harvard.edu>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
drivers/mmc/core/core.c | 54 +++++++++++++++++++++----------------
drivers/mmc/core/host.c | 6 ++++
include/linux/mmc/host.h | 3 ++
3 files changed, 41 insertions(+), 22 deletions(-)
diff -puN
drivers/mmc/core/core.c~mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume
drivers/mmc/core/core.c
---
a/drivers/mmc/core/core.c~mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume
+++ a/drivers/mmc/core/core.c
@@ -1267,26 +1267,11 @@ 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) {
if (host->bus_ops->suspend)
err = host->bus_ops->suspend(host);
- if (err == -ENOSYS || !host->bus_ops->resume) {
- /*
- * We simply "remove" the card in this case.
- * It will be redetected on resume.
- */
- if (host->bus_ops->remove)
- host->bus_ops->remove(host);
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_release_host(host);
- host->pm_flags = 0;
- err = 0;
- }
}
mmc_bus_put(host);
@@ -1318,12 +1303,6 @@ int mmc_resume_host(struct mmc_host *hos
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;
}
}
@@ -1338,6 +1317,37 @@ int mmc_resume_host(struct mmc_host *hos
return err;
}
+/* Do the card removal on suspend if card is assumed removeable
+ * Do that in pm notifier while userspace isn't yet frozen, so we will be able
+ to sync the card.
+*/
+int mmc_pm_notify(struct notifier_block *notify_block,
+ unsigned long mode, void *unused)
+{
+ struct mmc_host *host = container_of(
+ notify_block, struct mmc_host, pm_notify);
+
+
+ switch (mode) {
+ case PM_HIBERNATION_PREPARE:
+ case PM_SUSPEND_PREPARE:
+
+ if (!host->bus_ops || host->bus_ops->suspend)
+ break;
+
+ if (host->bus_ops->remove)
+ host->bus_ops->remove(host);
+ mmc_claim_host(host);
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+ host->pm_flags = 0;
+ break;
+
+ }
+
+ return 0;
+}
+
EXPORT_SYMBOL(mmc_resume_host);
#endif
@@ -1346,7 +1356,7 @@ static int __init mmc_init(void)
{
int ret;
- workqueue = create_singlethread_workqueue("kmmcd");
+ workqueue = create_freezeable_workqueue("kmmcd");
if (!workqueue)
return -ENOMEM;
diff -puN
drivers/mmc/core/host.c~mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume
drivers/mmc/core/host.c
---
a/drivers/mmc/core/host.c~mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume
+++ a/drivers/mmc/core/host.c
@@ -17,6 +17,7 @@
#include <linux/pagemap.h>
#include <linux/leds.h>
#include <linux/slab.h>
+#include <linux/suspend.h>
#include <linux/mmc/host.h>
@@ -85,6 +86,8 @@ struct mmc_host *mmc_alloc_host(int extr
init_waitqueue_head(&host->wq);
INIT_DELAYED_WORK(&host->detect, mmc_rescan);
INIT_DELAYED_WORK_DEFERRABLE(&host->disable, mmc_host_deeper_disable);
+ host->pm_notify.notifier_call = mmc_pm_notify;
+
/*
* By default, hosts do not support SGIO or large requests.
@@ -132,6 +135,7 @@ int mmc_add_host(struct mmc_host *host)
mmc_add_host_debugfs(host);
#endif
+ register_pm_notifier(&host->pm_notify);
mmc_start_host(host);
return 0;
@@ -158,6 +162,8 @@ void mmc_remove_host(struct mmc_host *ho
device_del(&host->class_dev);
led_trigger_unregister_simple(host->led);
+
+ unregister_pm_notifier(&host->pm_notify);
}
EXPORT_SYMBOL(mmc_remove_host);
diff -puN
include/linux/mmc/host.h~mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume
include/linux/mmc/host.h
---
a/include/linux/mmc/host.h~mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume
+++ a/include/linux/mmc/host.h
@@ -124,6 +124,7 @@ struct mmc_host {
unsigned int f_min;
unsigned int f_max;
u32 ocr_avail;
+ struct notifier_block pm_notify;
#define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 -
1.95 */
#define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
@@ -257,6 +258,8 @@ int mmc_card_can_sleep(struct mmc_host *
int mmc_host_enable(struct mmc_host *host);
int mmc_host_disable(struct mmc_host *host);
int mmc_host_lazy_disable(struct mmc_host *host);
+int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
+
static inline void mmc_set_disable_delay(struct mmc_host *host,
unsigned int disable_delay)
_
Patches currently in -mm which might be from maximlevit...@gmail.com are
linux-next.patch
maintainers-update-ricoh-smartmedia-xd-driver-file-patterns.patch
mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume.patch
mmc-fix-all-hangs-related-to-mmc-sd-card-insert-removal-during-suspend-resume-fix.patch
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