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authorJames Bottomley <James.Bottomley@HansenPartnership.com>2009-06-17 19:05:05 +0000
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-06-21 10:52:46 -0500
commita9e0edb687151617fe89cc5ab0086ebfc73ffccb (patch)
treecaac2147c99dee9650da01384c2605b21f2ec5bb
parent9872b81cf9f4b163e9c558d79e76b832c58a4814 (diff)
scsi_transport_spi: Blacklist Ultrium-3 tape for IU transfers
There have been several bug reports which identified the Ultrium-3 tape as just hanging up on the bus during certain types of IU transfer. The identified culpret is type 0x02 (MULTIPLE COMMAND) transfers. The only way to prevent this tape wedging is to prevent it from using IU transfers at all. So this patch uses the exported blacklist matching technology to recognise the drive and force it not to use IU transfers. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/scsi/scsi_priv.h1
-rw-r--r--drivers/scsi/scsi_transport_spi.c40
2 files changed, 40 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index b4e49cd6e75..00264aab8c8 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -43,6 +43,7 @@ static inline void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
/* list of keys for the lists */
enum {
SCSI_DEVINFO_GLOBAL = 0,
+ SCSI_DEVINFO_SPI,
};
extern int scsi_get_device_flags(struct scsi_device *sdev,
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 00cfb40b5ef..c25bd9a34e0 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -46,6 +46,22 @@
#define DV_RETRIES 3 /* should only need at most
* two cc/ua clears */
+/* Our blacklist flags */
+enum {
+ SPI_BLIST_NOIUS = 0x1,
+};
+
+/* blacklist table, modelled on scsi_devinfo.c */
+static struct {
+ char *vendor;
+ char *model;
+ unsigned flags;
+} spi_static_device_list[] __initdata = {
+ {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },
+ {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },
+ {NULL, NULL, 0}
+};
+
/* Private data accessors (keep these out of the header file) */
#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)
@@ -207,6 +223,9 @@ static int spi_device_configure(struct transport_container *tc,
{
struct scsi_device *sdev = to_scsi_device(dev);
struct scsi_target *starget = sdev->sdev_target;
+ unsigned bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],
+ &sdev->inquiry[16],
+ SCSI_DEVINFO_SPI);
/* Populate the target capability fields with the values
* gleaned from the device inquiry */
@@ -216,6 +235,10 @@ static int spi_device_configure(struct transport_container *tc,
spi_support_dt(starget) = scsi_device_dt(sdev);
spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
spi_support_ius(starget) = scsi_device_ius(sdev);
+ if (bflags & SPI_BLIST_NOIUS) {
+ dev_info(dev, "Information Units disabled by blacklist\n");
+ spi_support_ius(starget) = 0;
+ }
spi_support_qas(starget) = scsi_device_qas(sdev);
return 0;
@@ -1524,7 +1547,21 @@ EXPORT_SYMBOL(spi_release_transport);
static __init int spi_transport_init(void)
{
- int error = transport_class_register(&spi_transport_class);
+ int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,
+ "SCSI Parallel Transport Class");
+ if (!error) {
+ int i;
+
+ for (i = 0; spi_static_device_list[i].vendor; i++)
+ scsi_dev_info_list_add_keyed(1, /* compatible */
+ spi_static_device_list[i].vendor,
+ spi_static_device_list[i].model,
+ NULL,
+ spi_static_device_list[i].flags,
+ SCSI_DEVINFO_SPI);
+ }
+
+ error = transport_class_register(&spi_transport_class);
if (error)
return error;
error = anon_transport_class_register(&spi_device_class);
@@ -1536,6 +1573,7 @@ static void __exit spi_transport_exit(void)
transport_class_unregister(&spi_transport_class);
anon_transport_class_unregister(&spi_device_class);
transport_class_unregister(&spi_host_class);
+ scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);
}
MODULE_AUTHOR("Martin Hicks");