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scsi: NCR5380: Add disconnect_mask module parameter 

Add a module parameter to inhibit disconnect/reselect for individual
targets. This gains compatibility with Aztec PowerMonster SCSI/SATA
adapters with buggy firmware. (No fix is available from the vendor.)

Apparently these adapters pass-through the product/vendor of the attached
SATA device. Since they can't be identified from the response to an INQUIRY
command, a device blacklist flag won't work.

Cc: Michael Schmitz <schmitzmic@gmail.com>
Link: https://lore.kernel.org/r/993b17545990f31f9fa5a98202b51102a68e7594.1573875417.git.fthain@telegraphics.com.au
Reviewed-and-tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2019-11-16 14:36:57 +11:00 committed by Martin K. Petersen
parent d04fc41af2
commit 0b7a223552
1 changed files with 5 additions and 1 deletions
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6
drivers/scsi/NCR5380.c
View File

@ -129,6 +129,9 @@
#define NCR5380_release_dma_irq(x)
#endif
static unsigned int disconnect_mask = ~0;
module_param(disconnect_mask, int, 0444);
static int do_abort(struct Scsi_Host *);
static void do_reset(struct Scsi_Host *);
static void bus_reset_cleanup(struct Scsi_Host *);
@ -967,7 +970,8 @@ static bool NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
int err;
bool ret = true;
bool can_disconnect = instance->irq != NO_IRQ &&
cmd->cmnd[0] != REQUEST_SENSE;
cmd->cmnd[0] != REQUEST_SENSE &&
(disconnect_mask & BIT(scmd_id(cmd)));
NCR5380_dprint(NDEBUG_ARBITRATION, instance);
dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n",