From: Sergey Yanovich <ynvich@gmail.com>
To: Chris Ball <cjb@laptop.org>
Cc: Sergey Yanovich <ynvich@gmail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
Jaehoon Chung <jh80.chung@samsung.com>,
Namjae Jeon <linkinjeon@gmail.com>,
linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org
Subject: [PATCH] wait while adding MMC host to ensure root mounts
Date: Thu, 14 Mar 2013 05:06:23 +0400 [thread overview]
Message-ID: <1363223183-3772-1-git-send-email-ynvich@gmail.com> (raw)
MMC hosts are added asynchronously. We need to wait until detect returns to
avoid failed root filesystem mounts.
---8<---
VFS: Cannot open root device "mmcblk0p1" or unknown-block(0,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
mmc0: host does not support reading read-only switch. assuming write-enable.
1f00 256 mtdblock0 (driver?)
1f01 256 mtdblock1 (driver?)
1f02 2560 mtdblock2 mmc0: new SDHC card at address b368
(driver?)
1f03 29696 mtdblock3 (driver?)
1f04 16384 mtdblock4 mmcblk0: mmc0:b368 USD 3.72 GiB
(driver?)
mmcblk0: p1
b300 3910656 mmcblk0 driver: mmcblk
b301 3906560 mmcblk0p1 00000000-01
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
---8<---
Signed-off-by: Sergey Yanovich <ynvich@gmail.com>
---
drivers/base/dd.c | 1 -
drivers/mmc/core/core.c | 4 +++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 218f1e6..61d3e1b 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -345,7 +345,6 @@ int driver_probe_done(void)
void wait_for_device_probe(void)
{
/* wait for the known devices to complete their probing */
-
wait_event(probe_waitqueue, atomic_read(&probe_count) == 0);
async_synchronize_full();
}
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index aaed768..9790323 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -91,10 +91,11 @@ static int mmc_schedule_delayed_work(struct delayed_work *work,
/*
* Internal function. Flush all scheduled work from the MMC work queue.
*/
-static void mmc_flush_scheduled_work(void)
+void mmc_flush_scheduled_work(void)
{
flush_workqueue(workqueue);
}
+EXPORT_SYMBOL(mmc_flush_scheduled_work);
#ifdef CONFIG_FAIL_MMC_REQUEST
@@ -2225,6 +2226,7 @@ void mmc_start_host(struct mmc_host *host)
host->rescan_disable = 0;
mmc_power_up(host);
mmc_detect_change(host, 0);
+ mmc_flush_scheduled_work();
}
void mmc_stop_host(struct mmc_host *host)
--
1.7.10.4
next reply other threads:[~2013-03-14 1:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-14 1:06 Sergey Yanovich [this message]
2013-03-14 1:23 ` [PATCH v2] wait while adding MMC host to ensure root mounts Sergey Yanovich
2013-03-14 4:08 ` Namjae Jeon
2013-03-14 11:57 ` Sergey Yanovich
2013-03-15 2:51 ` Jaehoon Chung
2013-03-22 17:03 ` Chris Ball
2013-03-27 11:13 ` Ulf Hansson
2013-03-27 11:57 ` Chris Ball
2013-04-02 13:36 ` Adrian Hunter
2013-04-02 14:24 ` Sergey Yanovich
2013-04-04 6:35 ` Adrian Hunter
2013-04-04 10:59 ` Sergey Yanovich
2013-04-04 11:35 ` Adrian Hunter
2013-04-04 12:32 ` Sergey Yanovich
2013-04-13 10:49 ` Sergey Yanovich
2013-04-13 12:52 ` Chris Ball
[not found] ` <CAPDyKFrF8pmo7mfa_1Vi2n=JBFd1h+VULQ1hJB75=DmNx0erdw@mail.gmail.com>
2013-04-13 12:52 ` Sergey Yanovich
2013-03-27 12:28 ` Сергей Янович
2013-04-02 10:13 ` Ulf Hansson
2013-04-02 10:35 ` Sergey Yanovich
2013-04-02 17:45 ` Ulf Hansson
2013-04-02 18:56 ` Sergey Yanovich
2013-03-14 2:47 ` [PATCH] " Greg Kroah-Hartman
2013-03-14 10:28 ` Sergey Yanovich
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