From: Finn Thain fthain@telegraphics.com.au
[ Upstream commit 0b7a223552d455bcfba6fb9cfc5eef2b5fce1491 ]
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/993b17545990f31f9fa5a98202b51102a68e7594.157387541... 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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/NCR5380.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index 8ec68dcc0cc4..95a3e3bf2b43 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -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 *); @@ -946,7 +949,8 @@ 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",