tree 11868cba8c590854b91c28ca99a2c2149989b519
parent c86935898f7af4bbafa14c0f402a79925c53a33f
author Ulf Hansson <ulf.hansson@stericsson.com> 1316628493 -0400
committer Greg Kroah-Hartman <gregkh@suse.de> 1321032922 -0800

mmc: core: Fix hangs related to insert/remove of cards

commit 7f7e4129c23f0419257184dff6fec89d2d5a8964 upstream.

During a rescan operation mmc_attach(sd|mmc|sdio) functions are
called. The error handling in these function can trigger a detach
of the bus, which also meant a power off. This is not notified by
the rescan operation which then continues to the next attach function.

If a power off has been done, the framework must never send any
new commands to the host driver, without first doing a new power up.
This will most likely trigger any host driver to hang.

Moving power off out of detach and instead handle power off
separately when it is actually needed, solves the issue.

Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>