From mdharm@multivac.one-eyed-alien.net Thu Jul 28 14:46:57 2005 Date: Thu, 28 Jul 2005 14:43:08 -0700 From: Matthew Dharm Subject: USB Storage: remove dependency on SCSI-provided serial/tag number Message-ID: <20050728214308.GA31016@one-eyed-alien.net> This patch started life as as531 from Alan Stern. It has been rediffed against the latest tree. The SCSI people have deprecated the use of scsi_cmnd.serial_number for anything other than printk. Worse than that, the SCSI core doesn't always increment the number (when the error handler is running, for example). So this patch creates a locally-stored value for use in bulk-only tags. The net result is a simplification, since we no longer have to save & restore the serial_number value while autosensing. Signed-off-by: Alan Stern Signed-off-by: Matthew Dharm Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/transport.c | 10 ++-------- drivers/usb/storage/usb.h | 1 + 2 files changed, 3 insertions(+), 8 deletions(-) --- gregkh-2.6.orig/drivers/usb/storage/usb.h 2005-08-08 16:43:49.000000000 -0700 +++ gregkh-2.6/drivers/usb/storage/usb.h 2005-08-08 16:43:56.000000000 -0700 @@ -158,6 +158,7 @@ /* SCSI interfaces */ struct scsi_cmnd *srb; /* current srb */ + unsigned int tag; /* current dCBWTag */ /* thread information */ int pid; /* control thread */ --- gregkh-2.6.orig/drivers/usb/storage/transport.c 2005-08-08 16:43:49.000000000 -0700 +++ gregkh-2.6/drivers/usb/storage/transport.c 2005-08-08 16:43:56.000000000 -0700 @@ -611,7 +611,6 @@ unsigned char old_sc_data_direction; unsigned char old_cmd_len; unsigned char old_cmnd[MAX_COMMAND_SIZE]; - unsigned long old_serial_number; int old_resid; US_DEBUGP("Issuing auto-REQUEST_SENSE\n"); @@ -648,10 +647,6 @@ old_sg = srb->use_sg; srb->use_sg = 0; - /* change the serial number -- toggle the high bit*/ - old_serial_number = srb->serial_number; - srb->serial_number ^= 0x80000000; - /* issue the auto-sense command */ old_resid = srb->resid; srb->resid = 0; @@ -662,7 +657,6 @@ srb->request_buffer = old_request_buffer; srb->request_bufflen = old_request_bufflen; srb->use_sg = old_sg; - srb->serial_number = old_serial_number; srb->sc_data_direction = old_sc_data_direction; srb->cmd_len = old_cmd_len; memcpy(srb->cmnd, old_cmnd, MAX_COMMAND_SIZE); @@ -985,7 +979,7 @@ bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); bcb->DataTransferLength = cpu_to_le32(transfer_length); bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? 1 << 7 : 0; - bcb->Tag = srb->serial_number; + bcb->Tag = ++us->tag; bcb->Lun = srb->device->lun; if (us->flags & US_FL_SCM_MULT_TARG) bcb->Lun |= srb->device->id << 4; @@ -1074,7 +1068,7 @@ US_DEBUGP("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n", le32_to_cpu(bcs->Signature), bcs->Tag, residue, bcs->Status); - if (bcs->Tag != srb->serial_number || bcs->Status > US_BULK_STAT_PHASE) { + if (bcs->Tag != us->tag || bcs->Status > US_BULK_STAT_PHASE) { US_DEBUGP("Bulk logical error\n"); return USB_STOR_TRANSPORT_ERROR; }