Commit f9a94e0a authored Apr 04, 2013 by Adrian Hunter Committed by Chris Ball Apr 12, 2013

Revert "mmc: core: wait while adding MMC host to ensure root mounts successfully"



This reverts commit 3500ed90.

The reverted patch caused a significant performance regression when
booting with the root file system on eMMC.

Before the patch:

[    1.625623] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.

After the patch:

[    1.935851] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.

That was an addition of 310 ms which is a 19% performance degradation.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

parent bdbc5d0c

drivers/mmc/core/core.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -2418,7 +2418,6 @@ 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)

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