bcc71cc3cd
This patch fixes issue during switch command query where driver was freeing SRB resources multiple times Following stack trace will be seen [ 853.436234] BUG: unable to handle kernel NULL pointer dereference at 0000000000000001 [ 853.436348] IP: [<ffffffff811df514>] kmem_cache_alloc+0x74/0x1e0 [ 853.436476] PGD 0 [ 853.436601] Oops: 0000 [#1] SMP [ 853.454700] [<ffffffff81099f6a>] ? mod_timer+0x14a/0x220 [ 853.455543] [<ffffffff81185465>] mempool_alloc_slab+0x15/0x20 [ 853.456395] [<ffffffff811855a9>] mempool_alloc+0x69/0x170 [ 853.457257] [<ffffffff81098af2>] ? internal_add_timer+0x32/0x70 [ 853.458136] [<ffffffffc0092d2b>] qla2xxx_queuecommand+0x29b/0x3f0 [qla2xxx] [ 853.459024] [<ffffffff8146535a>] scsi_dispatch_cmd+0xaa/0x230 [ 853.459923] [<ffffffff8146e11f>] scsi_request_fn+0x4df/0x680 [ 853.460829] [<ffffffff81029557>] ? __switch_to+0xd7/0x510 [ 853.461747] [<ffffffff812f7113>] __blk_run_queue+0x33/0x40 [ 853.462670] [<ffffffff812f7735>] blk_delay_work+0x25/0x40 [ 853.463603] [<ffffffff810a882a>] process_one_work+0x17a/0x440 [ 853.464546] [<ffffffff810a94f6>] worker_thread+0x126/0x3c0 [ 853.465501] [<ffffffff810a93d0>] ? manage_workers.isra.24+0x2a0/0x2a0 [ 853.466447] [<ffffffff810b099f>] kthread+0xcf/0xe0 [ 853.467379] [<ffffffff810b08d0>] ? insert_kthread_work+0x40/0x40 [ 853.470172] Code: db e2 7e 49 8b 50 08 4d 8b 20 49 8b 40 10 4d 85 e4 0f 84 20 01 00 00 48 85 c0 0f 84 17 01 00 00 49 63 46 20 48 8d 4a 01 4d 8b 06 <49> 8b 1c 04 4c 89 e0 65 49 0f c7 08 0f 94 c0 84 c0 74 ba 49 63 [ 853.472072] RIP [<ffffffff811df514>] kmem_cache_alloc+0x74/0x1e0 [ 853.472971] RSP <ffff88103726fc50> Fixes: 726b85487067 ("qla2xxx: Add framework for async fabric discovery") Cc: <stable@vger.kernel.org> Signed-off-by: Giridhar Malavali <giridhar.malavali@cavium.com> Reviewed-by: Ewan D. Milne <emilne@redhat.com> Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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.
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.