lkml.org 
[lkml]   [2012]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH scsi] Add NULL checking of return value from scsi_cmd_to_driver()
From
Date
On Mon, 2012-09-24 at 13:30 +0800, Li Zhong wrote:
> Just noticed that after commit 919f797, it is possible that
> scsi_cmd_to_driver() returns NULL. This patch adds the NULL checking for drv
> returned from the above function.
>
> Maybe it is not possible at run time, but from the code itself, we'd better
> have this check?

There's not much point having a check that never trips, unless it's an
assert, in which case a NULL deref does that. All it does is add
pointless instructions to the critical path. only REQ_TYPE_BLOCK_PC
commands can be submitted without a driver, so the check above would
seem to preclude that.

James




\
 
 \ /
  Last update: 2012-09-24 08:21    [W:0.222 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site