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authorJames Bottomley <James.Bottomley@steeleye.com>2006-09-20 12:00:18 -0400
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-09-23 20:53:53 -0500
commitdfdc58ba354adb80d67c99f7be84f95a8e02e466 (patch)
tree9cbbe31f7d3d5be0029fd7c1a8eeaaa02e53853a
parenta07f353701acae77e023f6270e8af353b37af7c4 (diff)
[SCSI] SPI transport class: misc DV fixes
Key more of the domain validation settings off the inquiry data from the disk (in particular, don't try IU or DT unless the disk claims to support them. Also add a new dv_in_progress flag to prevent recursive DV. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r--drivers/scsi/scsi_transport_spi.c30
-rw-r--r--include/scsi/scsi_transport_spi.h3
2 files changed, 25 insertions, 8 deletions
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 29a9a53cdd1..9f070f0d0f2 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -47,6 +47,7 @@
/* Private data accessors (keep these out of the header file) */
#define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
+#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
struct spi_internal {
@@ -240,6 +241,7 @@ static int spi_setup_transport_attrs(struct transport_container *tc,
spi_pcomp_en(starget) = 0;
spi_hold_mcs(starget) = 0;
spi_dv_pending(starget) = 0;
+ spi_dv_in_progress(starget) = 0;
spi_initial_dv(starget) = 0;
mutex_init(&spi_dv_mutex(starget));
@@ -830,28 +832,37 @@ spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
DV_SET(period, spi_min_period(starget));
/* try QAS requests; this should be harmless to set if the
* target supports it */
- if (scsi_device_qas(sdev))
+ if (scsi_device_qas(sdev)) {
DV_SET(qas, 1);
- /* Also try IU transfers */
- if (scsi_device_ius(sdev))
+ } else {
+ DV_SET(qas, 0);
+ }
+
+ if (scsi_device_ius(sdev) && spi_min_period(starget) < 9) {
+ /* This u320 (or u640). Set IU transfers */
DV_SET(iu, 1);
- if (spi_min_period(starget) < 9) {
- /* This u320 (or u640). Ignore the coupled parameters
- * like DT and IU, but set the optional ones */
+ /* Then set the optional parameters */
DV_SET(rd_strm, 1);
DV_SET(wr_flow, 1);
DV_SET(rti, 1);
if (spi_min_period(starget) == 8)
DV_SET(pcomp_en, 1);
+ } else {
+ DV_SET(iu, 0);
}
+
/* now that we've done all this, actually check the bus
* signal type (if known). Some devices are stupid on
* a SE bus and still claim they can try LVD only settings */
if (i->f->get_signalling)
i->f->get_signalling(shost);
if (spi_signalling(shost) == SPI_SIGNAL_SE ||
- spi_signalling(shost) == SPI_SIGNAL_HVD)
+ spi_signalling(shost) == SPI_SIGNAL_HVD ||
+ !scsi_device_dt(sdev)) {
DV_SET(dt, 0);
+ } else {
+ DV_SET(dt, 1);
+ }
/* Do the read only INQUIRY tests */
spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
spi_dv_device_compare_inquiry);
@@ -907,6 +918,10 @@ spi_dv_device(struct scsi_device *sdev)
if (unlikely(scsi_device_get(sdev)))
return;
+ if (unlikely(spi_dv_in_progress(starget)))
+ return;
+ spi_dv_in_progress(starget) = 1;
+
buffer = kzalloc(len, GFP_KERNEL);
if (unlikely(!buffer))
@@ -938,6 +953,7 @@ spi_dv_device(struct scsi_device *sdev)
out_free:
kfree(buffer);
out_put:
+ spi_dv_in_progress(starget) = 0;
scsi_device_put(sdev);
}
EXPORT_SYMBOL(spi_dv_device);
diff --git a/include/scsi/scsi_transport_spi.h b/include/scsi/scsi_transport_spi.h
index 302680c0c0d..da180f73847 100644
--- a/include/scsi/scsi_transport_spi.h
+++ b/include/scsi/scsi_transport_spi.h
@@ -53,7 +53,8 @@ struct spi_transport_attrs {
unsigned int support_ius; /* support Information Units */
unsigned int support_qas; /* supports quick arbitration and selection */
/* Private Fields */
- unsigned int dv_pending:1; /* Internal flag */
+ unsigned int dv_pending:1; /* Internal flag: DV Requested */
+ unsigned int dv_in_progress:1; /* Internal: DV started */
struct mutex dv_mutex; /* semaphore to serialise dv */
};