linux-kernel - [PATCH v2] wait while adding MMC host to ensure root mounts

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Message-Id: <1363224194-7366-1-git-send-email-ynvich@gmail.com>
Date:	Thu, 14 Mar 2013 05:23:13 +0400
From:	Sergey Yanovich <ynvich@...il.com>
To:	Chris Ball <cjb@...top.org>
Cc:	Sergey Yanovich <ynvich@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Namjae Jeon <linkinjeon@...il.com>,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: [PATCH v2] wait while adding MMC host to ensure root mounts

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@...il.com>
---
changes for v2:
- removed exporting as symbol is in the same file

 drivers/mmc/core/core.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index aaed768..7196888 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2225,6 +2225,7 @@ 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

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