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authorMatthew Dharm <mdharm-usb@one-eyed-alien.net>2005-07-28 23:43:08 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2005-09-09 01:22:54 +0200
commit0f64e078139109d1902e5b1274c23cec9a9ad12e (patch)
tree282cb78a17c0ed2dc403dc7712cda1fc348e2123 /drivers/usb
parent[PATCH] USB: Switch isp116x-hcd over to root hub interrupt (diff)
downloadlinux-0f64e078139109d1902e5b1274c23cec9a9ad12e.tar.xz
linux-0f64e078139109d1902e5b1274c23cec9a9ad12e.zip
[PATCH] USB Storage: remove dependency on SCSI-provided serial/tag number
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 <stern@rowland.harvard.edu> Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/storage/transport.c10
-rw-r--r--drivers/usb/storage/usb.h1
2 files changed, 3 insertions, 8 deletions
diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index e6b1c6cf07f2..e42875152c34 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -611,7 +611,6 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
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 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
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 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
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 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
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 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
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;
}
diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h
index 625b7aa98074..a195adae57b6 100644
--- a/drivers/usb/storage/usb.h
+++ b/drivers/usb/storage/usb.h
@@ -158,6 +158,7 @@ struct us_data {
/* SCSI interfaces */
struct scsi_cmnd *srb; /* current srb */
+ unsigned int tag; /* current dCBWTag */
/* thread information */
int pid; /* control thread */