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Filename Latest commit message Latest commit date
Wolfram Sang 2d95959fa4 mmc: core: clear flags before allowing to retune 
commit 77347eda64ed5c9383961d1de9165f9d0b7d8df6 upstream.

It might be that something goes wrong during tuning so the MMC core will
immediately trigger a retune. In our case it was:

 - we sent a tuning block
 - there was an error so we need to send an abort cmd to the eMMC
 - the abort cmd had a CRC error
 - retune was set by the MMC core

This lead to a vicious circle causing a performance regression of 75%.
So, clear retuning flags before we enable retuning to start with a known
cleared state.

Reported-by Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Fixes: bd11e8bd03 ("mmc: core: Flag re-tuning is needed on CRC errors")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210624151616.38770-2-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-19 08:53:15 +02:00
arch powerpc/barrier: Avoid collision with clang's __lwsync macro 2021-07-19 08:53:14 +02:00
block
certs
crypto
Documentation
drivers mmc: core: clear flags before allowing to retune 2021-07-19 08:53:15 +02:00
fs fscrypt: don't ignore minor_hash when hash is 0 2021-07-19 08:53:14 +02:00
include sctp: validate from_addr_param return 2021-07-19 08:53:13 +02:00
init
ipc
kernel bpf: Fix up register-based shifts in interpreter to silence KUBSAN 2021-07-19 08:53:11 +02:00
lib
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net sctp: add size validation when walking chunks 2021-07-19 08:53:13 +02:00
samples
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security selinux: use __GFP_NOWARN with GFP_NOWAIT in the AVC 2021-07-19 08:53:10 +02:00
sound
tools perf bench: Fix 2 memory sanitizer warnings 2021-07-19 08:53:14 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

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.