scsi: core: Fix the scsi_set_resid() documentation

commit f669b8a683 upstream.

Because scsi_finish_command() subtracts the residual from the buffer
length, residual overflows must not be reported. Reflect this in the SCSI
documentation. See also commit 9237f04e12 ("scsi: core: Fix
scsi_get/set_resid() interface")

Cc: Damien Le Moal <dlemoal@kernel.org>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: stable@vger.kernel.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230721160154.874010-2-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bart Van Assche 2023-07-21 09:01:32 -07:00 committed by Greg Kroah-Hartman
parent 2344b13976
commit 157c46360c
1 changed files with 2 additions and 2 deletions

View File

@ -1190,11 +1190,11 @@ Members of interest:
- pointer to scsi_device object that this command is
associated with.
resid
- an LLD should set this signed integer to the requested
- an LLD should set this unsigned integer to the requested
transfer length (i.e. 'request_bufflen') less the number
of bytes that are actually transferred. 'resid' is
preset to 0 so an LLD can ignore it if it cannot detect
underruns (overruns should be rare). If possible an LLD
underruns (overruns should not be reported). An LLD
should set 'resid' prior to invoking 'done'. The most
interesting case is data transfers from a SCSI target
device (e.g. READs) that underrun.