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Krzysztof Kozlowski 5f3fcbf5b5 dmaengine: mcf-edma: Fix NULL pointer exception in mcf_edma_tx_handler 
commit 8995aa3d16 upstream.

On Toradex Colibri VF50 (Vybrid VF5xx) with fsl-edma driver NULL pointer
exception happens occasionally on serial output initiated by login
timeout.

This was reproduced only if kernel was built with significant debugging
options and EDMA driver is used with serial console.

Issue looks like a race condition between interrupt handler
fsl_edma_tx_handler() (called as a result of fsl_edma_xfer_desc()) and
terminating the transfer with fsl_edma_terminate_all().

The fsl_edma_tx_handler() handles interrupt for a transfer with already
freed edesc and idle==true.

The mcf-edma driver shares design and lot of code with fsl-edma.  It
looks like being affected by same problem.  Fix this pattern the same
way as fix for fsl-edma driver.

Fixes: e7a3ff92ea ("dmaengine: fsl-edma: add ColdFire mcf5441x edma support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Robin Gong <yibin.gong@nxp.com>
Link: https://lore.kernel.org/r/1591881665-25592-1-git-send-email-krzk@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-07-22 09:33:15 +02:00
Documentation doc: dt: bindings: usb: dwc3: Update entries for disabling SS instances in park mode 2020-07-22 09:32:59 +02:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
arch powerpc/pseries/svm: Fix incorrect check for shared_lppaca_size 2020-07-22 09:33:14 +02:00
block blk-mq-debugfs: update blk_queue_flag_name[] accordingly for new flags 2020-07-22 09:32:52 +02:00
certs PKCS#7: Refactor verify_pkcs7_signature() 2019-08-05 18:40:18 -04:00
crypto keys: asymmetric: fix error return code in software_key_query() 2020-07-22 09:33:04 +02:00
drivers dmaengine: mcf-edma: Fix NULL pointer exception in mcf_edma_tx_handler 2020-07-22 09:33:15 +02:00
fs fuse: Fix parameter for FS_IOC_{GET,SET}FLAGS 2020-07-22 09:33:12 +02:00
include Input: elan_i2c - add more hardware ID for Lenovo laptops 2020-07-22 09:33:13 +02:00
init x86: Fix early boot crash on gcc-10, third try 2020-05-20 08:20:34 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:20:16 +02:00
kernel timer: Fix wheel index calculation on last level 2020-07-22 09:33:14 +02:00
lib test_objagg: Fix potential memory leak in error handling 2020-06-30 15:37:04 -04:00
mm mm, compaction: make capture control handling safe wrt interrupts 2020-07-09 09:37:57 +02:00
net xprtrdma: fix incorrect header size calculations 2020-07-22 09:33:03 +02:00
samples samples/vfs: avoid warning in statx override 2020-07-09 09:37:54 +02:00
scripts recordmcount: support >64k sections 2020-06-30 15:37:05 -04:00
security apparmor: ensure that dfa state tables have entries 2020-07-22 09:33:05 +02:00
sound ALSA: hda/realtek - Enable Speaker for ASUS UX563 2020-07-22 09:33:09 +02:00
tools perf stat: Zero all the 'ena' and 'run' array slot stats for interval mode 2020-07-22 09:33:05 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: arm64: Save the host's PtrAuth keys in non-preemptible context 2020-06-17 16:40:38 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Modules updates for v5.4 2019-09-22 10:34:46 -07:00
.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer 2019-10-10 08:12:51 -07:00
Kbuild kbuild: do not descend to ./Kbuild when cleaning 2019-08-21 21:03:58 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 17:22:19 +01:00
Makefile Linux 5.4.52 2020-07-16 08:16:48 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.