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.
Minchan Kim
authored
If blkdev_get fails, we shouldn't do blkdev_put. Otherwise, kernel emits
below log. This patch fixes it.
WARNING: CPU: 0 PID: 1893 at fs/block_dev.c:1828 blkdev_put+0x105/0x120
Modules linked in:
CPU: 0 PID: 1893 Comm: swapoff Not tainted 4.19.0+ #453
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
RIP: 0010:blkdev_put+0x105/0x120
Call Trace:
__x64_sys_swapoff+0x46d/0x490
do_syscall_64+0x5a/0x190
entry_SYSCALL_64_after_hwframe+0x49/0xbe
irq event stamp: 4466
hardirqs last enabled at (4465): __free_pages_ok+0x1e3/0x490
hardirqs last disabled at (4466): trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last enabled at (3420): __do_softirq+0x333/0x446
softirqs last disabled at (3407): irq_exit+0xd1/0xe0
Link: http://lkml.kernel.org/r/20181127055429.251614-3-minchan@kernel.org
Signed-off-by: 
Minchan Kim <minchan@kernel.org>
Reviewed-by: 
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: 
Joey Pabalinas <joeypabalinas@gmail.com>
Cc: <stable@vger.kernel.org> [4.14+]
Signed-off-by: 
Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: 
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