Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ffb43494 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by James Bottomley
Browse files

[SCSI] st: add st_scsi_kern_execute helper function 



st_scsi_kern_execute is a helper function to perform SCSI commands
synchronously. It supports data transfer with a liner in-kernel buffer
(not scatter gather). st_scsi_kern_execute internally uses
scsi_execute().

The majority of st_do_scsi can be replaced with
st_scsi_kern_execute. This is a preparation for rewriting st_do_scsi
to remove obsolete scsi_execute_async().

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent 4deba245

drivers/scsi/st.c

+22 −0
Original line number Diff line number Diff line
@@ -533,6 +533,28 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd 
	return SRpnt;

}



static int st_scsi_kern_execute(struct st_request *streq,

				const unsigned char *cmd, int data_direction,

				void *buffer, unsigned bufflen, int timeout,

				int retries)

{

	struct scsi_tape *stp = streq->stp;

	int ret, resid;



	stp->buffer->cmdstat.have_sense = 0;

	memcpy(streq->cmd, cmd, sizeof(streq->cmd));



	ret = scsi_execute(stp->device, cmd, data_direction, buffer, bufflen,

			   streq->sense, timeout, retries, 0, &resid);

	if (driver_byte(ret) & DRIVER_ERROR)

		return -EBUSY;



	stp->buffer->cmdstat.midlevel_result = streq->result = ret;

	stp->buffer->cmdstat.residual = resid;

	stp->buffer->syscall_result = st_chk_result(stp, streq);



	return 0;

}



/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if

   write has been correct but EOM early warning reached, -EIO if write ended in