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05 April 2024, 19:05:47 UTC
Revision e2ebfb2142acefecc2496e71360f50d25726040b authored by Adrian Hunter on 20 March 2017, 17:50:29 UTC, committed by Ulf Hansson on 23 March 2017, 08:24:04 UTC 
mmc: sdhci: Do not disable interrupts while waiting for clock
 
Disabling interrupts for even a millisecond can cause problems for some
devices. That can happen when sdhci changes clock frequency because it
waits for the clock to become stable under a spin lock.

The spin lock is not necessary here. Anything that is racing with changes
to the I/O state is already broken. The mmc core already provides
synchronization via "claiming" the host.

Although the spin lock probably should be removed from the code paths that
lead to this point, such a patch would touch too much code to be suitable
for stable trees. Consequently, for this patch, just drop the spin lock
while waiting.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Ludovic Desroches <ludovic.desroches@microchip.com>
1 parent 181302d
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Tip revision: e2ebfb2142acefecc2496e71360f50d25726040b authored by Adrian Hunter on 20 March 2017, 17:50:29 UTC
mmc: sdhci: Do not disable interrupts while waiting for clock
Tip revision: e2ebfb2
README 
Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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