diff options
| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-08-23 01:53:31 +0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-10-03 20:46:13 +0400 |
| commit | 6f4267e3bd1211b3d09130e626b0b3d885077610 (patch) | |
| tree | e9350f919238866c3bcd9c340ffea639a0c5de1d /drivers/scsi/scsi_scan.c | |
| parent | 0f1d87a2acb8fd1f2ef8af109a785123ddc1a6cb (diff) | |
| download | linux-6f4267e3bd1211b3d09130e626b0b3d885077610.tar.xz | |
[SCSI] Update the SCSI state model to allow blocking in the created state
Brian King <brking@linux.vnet.ibm.com> reported that fibre channel
devices can oops during scanning if their ports block (because the
device goes from CREATED -> BLOCK -> RUNNING rather than CREATED ->
BLOCK -> CREATED).
Fix this by adding a new state: CREATED_BLOCK which can only transition
back to CREATED and disallow the CREATED -> BLOCK transition. Now both
the created and blocked states that the mid-layer recognises can include
CREATED_BLOCK.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 2926baaac31e..334862e26a1b 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -730,6 +730,8 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, int *bflags, int async) { + int ret; + /* * XXX do not save the inquiry, since it can change underneath us, * save just vendor/model/rev. @@ -885,7 +887,17 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, /* set the device running here so that slave configure * may do I/O */ - scsi_device_set_state(sdev, SDEV_RUNNING); + ret = scsi_device_set_state(sdev, SDEV_RUNNING); + if (ret) { + ret = scsi_device_set_state(sdev, SDEV_BLOCK); + + if (ret) { + sdev_printk(KERN_ERR, sdev, + "in wrong state %s to complete scan\n", + scsi_device_state_name(sdev->sdev_state)); + return SCSI_SCAN_NO_RESPONSE; + } + } if (*bflags & BLIST_MS_192_BYTES_FOR_3F) sdev->use_192_bytes_for_3f = 1; @@ -899,7 +911,7 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, transport_configure_device(&sdev->sdev_gendev); if (sdev->host->hostt->slave_configure) { - int ret = sdev->host->hostt->slave_configure(sdev); + ret = sdev->host->hostt->slave_configure(sdev); if (ret) { /* * if LLDD reports slave not present, don't clutter |