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b10907b815
Only caller of the __nvme_submit_sync_cmd() with qid value not equal to
NVME_QID_ANY is nvmf_connect_io_queues(), where qid value is alway set
to > 0.
[1] __nvme_submit_sync_cmd() callers with qid parameter from :-
Caller | qid parameter
------------------------------------------------------
* nvme_fc_connect_io_queues() |
nvmf_connect_io_queue() | qid > 0
* nvme_rdma_start_io_queues() |
nvme_rdma_start_queue() |
nvmf_connect_io_queues() | qid > 0
* nvme_tcp_start_io_queues() |
nvme_tcp_start_queue() |
nvmf_connect_io_queues() | qid > 0
* nvme_loop_connect_io_queues() |
nvmf_connect_io_queues() | qid > 0
When qid value of the function parameter __nvme_submit_sync_cmd() is > 0
from above callers, we use blk_mq_alloc_request_hctx(), where we pass
last parameter as 0 if qid functional parameter value is set to 0 with
conditional operators, see 1002 :-
991 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
992 union nvme_result *result, void *buffer, unsigned bufflen,
993 int qid, int at_head, blk_mq_req_flags_t flags)
994 {
995 struct request *req;
996 int ret;
997
998 if (qid == NVME_QID_ANY)
999 req = blk_mq_alloc_request(q, nvme_req_op(cmd), flags);
1000 else
1001 req = blk_mq_alloc_request_hctx(q, nvme_req_op(cmd), flags,
1002 qid ? qid - 1 : 0);
1003
But qid function parameter value of the __nvme_submit_sync_cmd() will
never be 0 from above caller list see [1], and all the other callers of
__nvme_submit_sync_cmd() use NVME_QID_ANY as qid value :-
1. nvme_submit_sync_cmd()
2. nvme_features()
3. nvme_sec_submit()
4. nvmf_reg_read32()
5. nvmf_reg_read64()
6. nvmf_ref_write32()
7. nvmf_connect_admin_queue()
Remove the conditional operator to pass the qid as 0 in the call to
blk_mq_alloc_requst_hctx().
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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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.