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Stefan Haberland 08bccd7212 s390/dasd: fix hanging IO request during DASD driver unbind 
commit 66f669a272898feb1c69b770e1504aa2ec7723d1 upstream.

Prevent that an IO request is build during device shutdown initiated by
a driver unbind. This request will never be able to be processed or
canceled and will hang forever. This will lead also to a hanging unbind.

Fix by checking not only if the device is in READY state but also check
that there is no device offline initiated before building a new IO request.

Fixes: e443343e50 ("s390/dasd: blk-mq conversion")

Cc: <stable@vger.kernel.org> # v4.14+
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Tested-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-17 17:06:28 +01:00
arch arm64: perf: Fix 64-bit event counter read truncation 2021-03-17 17:06:28 +01:00
block block: Discard page cache of zone reset target range 2021-03-17 17:06:27 +01:00
certs
crypto
Documentation drivers/base/memory: don't store phys_device in memory blocks 2021-03-17 17:06:25 +01:00
drivers s390/dasd: fix hanging IO request during DASD driver unbind 2021-03-17 17:06:28 +01:00
fs block: Try to handle busy underlying device on discard 2021-03-17 17:06:27 +01:00
include arm64: mte: Map hotplugged memory as Normal Tagged 2021-03-17 17:06:28 +01:00
init
ipc
kernel sysctl.c: fix underflow value setting risk in vm_table 2021-03-17 17:06:25 +01:00
lib kasan: fix memory corruption in kasan_bitops_tags test 2021-03-17 17:06:25 +01:00
LICENSES
mm arm64: mte: Map hotplugged memory as Normal Tagged 2021-03-17 17:06:28 +01:00
net net: dsa: tag_mtk: fix 802.1ad VLAN egress 2021-03-17 17:06:22 +01:00
samples samples, bpf: Add missing munmap in xdpsock 2021-03-17 17:06:12 +01:00
scripts
security Revert 95ebabde382c ("capabilities: Don't allow writing ambiguous v3 file capabilities") 2021-03-17 17:06:27 +01:00
sound ALSA: usb-audio: fix use after free in usb_audio_disconnect 2021-03-17 17:06:27 +01:00
tools perf report: Fix -F for branch & mem modes 2021-03-17 17:06:17 +01:00
usr
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Makefile kbuild: clamp SUBLEVEL to 255 2021-03-17 17:06:25 +01:00
README

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.