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scsi: scsi_debug: call resp_*() function after setting host_scribble

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Error injection in scsi_debug (e.g. opts=16, SDEBUG_OPT_TRANSPORT_ERR)
currently doesn't work correctly because the test for sqcp in
resp_read_dt0() and similar resp_*() functions always fails.  sqcp is
set from cmnd->host_scribble, which is set in schedule_resp(), which is
called from scsi_debug_queuecommand() after calling the resp_* function.

Defer calling resp_*() until after cmnd->host_scribble is set in
schedule_resp().

Fixes: c483739430 "scsi_debug: add multiple queue support"
Signed-off-by: Martin Wilck <mwilck@suse.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Martin Wilck 2018-02-14 11:05:57 +01:00 committed by Martin K. Petersen
parent c62f40bfb2
commit f66b85171a
1 changed files with 33 additions and 20 deletions
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53
drivers/scsi/scsi_debug.c
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@ -4315,7 +4315,10 @@ static void setup_inject(struct sdebug_queue *sqp,
* SCSI_MLQUEUE_HOST_BUSY if temporarily out of resources.
*/
static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
int scsi_result, int delta_jiff, int ndelay)
int scsi_result,
int (*pfp)(struct scsi_cmnd *,
struct sdebug_dev_info *),
int delta_jiff, int ndelay)
{
unsigned long iflags;
int k, num_in_q, qdepth, inject;
@ -4331,9 +4334,6 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
}
sdp = cmnd->device;
if (unlikely(sdebug_verbose && scsi_result))
sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n",
__func__, scsi_result);
if (delta_jiff == 0)
goto respond_in_thread;
@ -4388,7 +4388,6 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
sqcp = &sqp->qc_arr[k];
sqcp->a_cmnd = cmnd;
cmnd->host_scribble = (unsigned char *)sqcp;
cmnd->result = scsi_result;
sd_dp = sqcp->sd_dp;
spin_unlock_irqrestore(&sqp->qc_lock, iflags);
if (unlikely(sdebug_every_nth && sdebug_any_injecting_opt))
@ -4398,6 +4397,22 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
if (sd_dp == NULL)
return SCSI_MLQUEUE_HOST_BUSY;
}
cmnd->result = pfp != NULL ? pfp(cmnd, devip) : 0;
if (cmnd->result & SDEG_RES_IMMED_MASK) {
/*
* This is the F_DELAY_OVERR case. No delay.
*/
cmnd->result &= ~SDEG_RES_IMMED_MASK;
delta_jiff = ndelay = 0;
}
if (cmnd->result == 0 && scsi_result != 0)
cmnd->result = scsi_result;
if (unlikely(sdebug_verbose && cmnd->result))
sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n",
__func__, cmnd->result);
if (delta_jiff > 0 || ndelay > 0) {
ktime_t kt;
@ -4440,7 +4455,10 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
return 0;
respond_in_thread: /* call back to mid-layer using invocation thread */
cmnd->result = scsi_result;
cmnd->result = pfp != NULL ? pfp(cmnd, devip) : 0;
cmnd->result &= ~SDEG_RES_IMMED_MASK;
if (cmnd->result == 0 && scsi_result != 0)
cmnd->result = scsi_result;
cmnd->scsi_done(cmnd);
return 0;
}
@ -5628,6 +5646,7 @@ static int scsi_debug_queuecommand(struct Scsi_Host *shost,
struct sdebug_dev_info *devip;
u8 *cmd = scp->cmnd;
int (*r_pfp)(struct scsi_cmnd *, struct sdebug_dev_info *);
int (*pfp)(struct scsi_cmnd *, struct sdebug_dev_info *) = NULL;
int k, na;
int errsts = 0;
u32 flags;
@ -5749,19 +5768,13 @@ static int scsi_debug_queuecommand(struct Scsi_Host *shost,
return 0; /* ignore command: make trouble */
}
if (likely(oip->pfp))
errsts = oip->pfp(scp, devip); /* calls a resp_* function */
else if (r_pfp) /* if leaf function ptr NULL, try the root's */
errsts = r_pfp(scp, devip);
if (errsts & SDEG_RES_IMMED_MASK) {
errsts &= ~SDEG_RES_IMMED_MASK;
flags |= F_DELAY_OVERR;
flags &= ~F_LONG_DELAY;
}
pfp = oip->pfp; /* calls a resp_* function */
else
pfp = r_pfp; /* if leaf function ptr NULL, try the root's */
fini:
if (F_DELAY_OVERR & flags)
return schedule_resp(scp, devip, errsts, 0, 0);
return schedule_resp(scp, devip, errsts, pfp, 0, 0);
else if ((sdebug_jdelay || sdebug_ndelay) && (flags & F_LONG_DELAY)) {
/*
* If any delay is active, want F_LONG_DELAY to be at least 1
@ -5771,14 +5784,14 @@ fini:
int jdelay = (sdebug_jdelay < 2) ? 1 : sdebug_jdelay;
jdelay = mult_frac(USER_HZ * jdelay, HZ, USER_HZ);
return schedule_resp(scp, devip, errsts, jdelay, 0);
return schedule_resp(scp, devip, errsts, pfp, jdelay, 0);
} else
return schedule_resp(scp, devip, errsts, sdebug_jdelay,
return schedule_resp(scp, devip, errsts, pfp, sdebug_jdelay,
sdebug_ndelay);
check_cond:
return schedule_resp(scp, devip, check_condition_result, 0, 0);
return schedule_resp(scp, devip, check_condition_result, NULL, 0, 0);
err_out:
return schedule_resp(scp, NULL, DID_NO_CONNECT << 16, 0, 0);
return schedule_resp(scp, NULL, DID_NO_CONNECT << 16, NULL, 0, 0);
}
static struct scsi_host_template sdebug_driver_template = {