scsiglue.c
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- /* Driver for USB Mass Storage compliant devices
- * SCSI layer glue code
- *
- * $Id: scsiglue.c,v 1.24 2001/11/11 03:33:58 mdharm Exp $
- *
- * Current development and maintenance by:
- * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
- *
- * Developed with the assistance of:
- * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
- * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)
- *
- * Initial work by:
- * (c) 1999 Michael Gee (michael@linuxspecific.com)
- *
- * This driver is based on the 'USB Mass Storage Class' document. This
- * describes in detail the protocol used to communicate with such
- * devices. Clearly, the designers had SCSI and ATAPI commands in
- * mind when they created this document. The commands are all very
- * similar to commands in the SCSI-II and ATAPI specifications.
- *
- * It is important to note that in a number of cases this class
- * exhibits class-specific exemptions from the USB specification.
- * Notably the usage of NAK, STALL and ACK differs from the norm, in
- * that they are used to communicate wait, failed and OK on commands.
- *
- * Also, for certain devices, the interrupt endpoint is used to convey
- * status of a command.
- *
- * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
- * information about this driver.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include "scsiglue.h"
- #include "usb.h"
- #include "debug.h"
- #include "transport.h"
- #include <linux/slab.h>
- /*
- * kernel thread actions
- */
- #define US_ACT_COMMAND 1
- #define US_ACT_DEVICE_RESET 2
- #define US_ACT_BUS_RESET 3
- #define US_ACT_HOST_RESET 4
- #define US_ACT_EXIT 5
- /***********************************************************************
- * Host functions
- ***********************************************************************/
- static const char* host_info(struct Scsi_Host *host)
- {
- return "SCSI emulation for USB Mass Storage devices";
- }
- /* detect a virtual adapter (always works) */
- static int detect(struct SHT *sht)
- {
- struct us_data *us;
- char local_name[32];
- /* This is not nice at all, but how else are we to get the
- * data here? */
- us = (struct us_data *)sht->proc_dir;
- /* set up the name of our subdirectory under /proc/scsi/ */
- sprintf(local_name, "usb-storage-%d", us->host_number);
- sht->proc_name = kmalloc (strlen(local_name) + 1, GFP_KERNEL);
- if (!sht->proc_name)
- return 0;
- strcpy(sht->proc_name, local_name);
- /* we start with no /proc directory entry */
- sht->proc_dir = NULL;
- /* register the host */
- us->host = scsi_register(sht, sizeof(us));
- if (us->host) {
- us->host->hostdata[0] = (unsigned long)us;
- us->host_no = us->host->host_no;
- return 1;
- }
- /* odd... didn't register properly. Abort and free pointers */
- kfree(sht->proc_name);
- sht->proc_name = NULL;
- return 0;
- }
- /* Release all resources used by the virtual host
- *
- * NOTE: There is no contention here, because we're already deregistered
- * the driver and we're doing each virtual host in turn, not in parallel
- */
- static int release(struct Scsi_Host *psh)
- {
- struct us_data *us = (struct us_data *)psh->hostdata[0];
- US_DEBUGP("release() called for host %sn", us->htmplt.name);
- /* Kill the control threads
- *
- * Enqueue the command, wake up the thread, and wait for
- * notification that it's exited.
- */
- US_DEBUGP("-- sending US_ACT_EXIT command to threadn");
- us->action = US_ACT_EXIT;
-
- up(&(us->sema));
- wait_for_completion(&(us->notify));
- /* remove the pointer to the data structure we were using */
- (struct us_data*)psh->hostdata[0] = NULL;
- /* we always have a successful release */
- return 0;
- }
- /* run command */
- static int command( Scsi_Cmnd *srb )
- {
- US_DEBUGP("Bad use of us_commandn");
- return DID_BAD_TARGET << 16;
- }
- /* run command */
- static int queuecommand( Scsi_Cmnd *srb , void (*done)(Scsi_Cmnd *))
- {
- struct us_data *us = (struct us_data *)srb->host->hostdata[0];
- US_DEBUGP("queuecommand() calledn");
- srb->host_scribble = (unsigned char *)us;
- /* get exclusive access to the structures we want */
- down(&(us->queue_exclusion));
- /* enqueue the command */
- us->queue_srb = srb;
- srb->scsi_done = done;
- us->action = US_ACT_COMMAND;
- /* release the lock on the structure */
- up(&(us->queue_exclusion));
- /* wake up the process task */
- up(&(us->sema));
- return 0;
- }
- /***********************************************************************
- * Error handling functions
- ***********************************************************************/
- /* Command abort */
- static int command_abort( Scsi_Cmnd *srb )
- {
- struct us_data *us = (struct us_data *)srb->host->hostdata[0];
- US_DEBUGP("command_abort() calledn");
- /* if we're stuck waiting for an IRQ, simulate it */
- if (atomic_read(us->ip_wanted)) {
- US_DEBUGP("-- simulating missing IRQn");
- up(&(us->ip_waitq));
- }
- /* if the device has been removed, this worked */
- if (!us->pusb_dev) {
- US_DEBUGP("-- device removed alreadyn");
- return SUCCESS;
- }
- /* if we have an urb pending, let's wake the control thread up */
- if (us->current_urb->status == -EINPROGRESS) {
- /* cancel the URB -- this will automatically wake the thread */
- usb_unlink_urb(us->current_urb);
- /* wait for us to be done */
- wait_for_completion(&(us->notify));
- return SUCCESS;
- }
- US_DEBUGP ("-- nothing to abortn");
- return FAILED;
- }
- /* This invokes the transport reset mechanism to reset the state of the
- * device */
- static int device_reset( Scsi_Cmnd *srb )
- {
- struct us_data *us = (struct us_data *)srb->host->hostdata[0];
- US_DEBUGP("device_reset() calledn" );
- return us->transport_reset(us);
- }
- /* This resets the device port, and simulates the device
- * disconnect/reconnect for all drivers which have claimed other
- * interfaces. */
- static int bus_reset( Scsi_Cmnd *srb )
- {
- struct us_data *us = (struct us_data *)srb->host->hostdata[0];
- int i;
- int result;
- /* we use the usb_reset_device() function to handle this for us */
- US_DEBUGP("bus_reset() calledn");
- /* if the device has been removed, this worked */
- if (!us->pusb_dev) {
- US_DEBUGP("-- device removed alreadyn");
- return SUCCESS;
- }
- /* release the IRQ, if we have one */
- down(&(us->irq_urb_sem));
- if (us->irq_urb) {
- US_DEBUGP("-- releasing irq URBn");
- result = usb_unlink_urb(us->irq_urb);
- US_DEBUGP("-- usb_unlink_urb() returned %dn", result);
- }
- up(&(us->irq_urb_sem));
- /* attempt to reset the port */
- if (usb_reset_device(us->pusb_dev) < 0)
- return FAILED;
- /* FIXME: This needs to lock out driver probing while it's working
- * or we can have race conditions */
- for (i = 0; i < us->pusb_dev->actconfig->bNumInterfaces; i++) {
- struct usb_interface *intf =
- &us->pusb_dev->actconfig->interface[i];
- const struct usb_device_id *id;
- /* if this is an unclaimed interface, skip it */
- if (!intf->driver) {
- continue;
- }
- US_DEBUGP("Examinging driver %s...", intf->driver->name);
- /* skip interfaces which we've claimed */
- if (intf->driver == &usb_storage_driver) {
- US_DEBUGPX("skipping ourselves.n");
- continue;
- }
- /* simulate a disconnect and reconnect for all interfaces */
- US_DEBUGPX("simulating disconnect/reconnect.n");
- down(&intf->driver->serialize);
- intf->driver->disconnect(us->pusb_dev, intf->private_data);
- id = usb_match_id(us->pusb_dev, intf, intf->driver->id_table);
- intf->driver->probe(us->pusb_dev, i, id);
- up(&intf->driver->serialize);
- }
- /* re-allocate the IRQ URB and submit it to restore connectivity
- * for CBI devices
- */
- if (us->protocol == US_PR_CBI) {
- down(&(us->irq_urb_sem));
- us->irq_urb->dev = us->pusb_dev;
- result = usb_submit_urb(us->irq_urb);
- US_DEBUGP("usb_submit_urb() returns %dn", result);
- up(&(us->irq_urb_sem));
- }
- US_DEBUGP("bus_reset() completen");
- return SUCCESS;
- }
- /* FIXME: This doesn't do anything right now */
- static int host_reset( Scsi_Cmnd *srb )
- {
- printk(KERN_CRIT "usb-storage: host_reset() requested but not implementedn" );
- return FAILED;
- }
- /***********************************************************************
- * /proc/scsi/ functions
- ***********************************************************************/
- /* we use this macro to help us write into the buffer */
- #undef SPRINTF
- #define SPRINTF(args...)
- do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
- static int proc_info (char *buffer, char **start, off_t offset, int length,
- int hostno, int inout)
- {
- struct us_data *us;
- char *pos = buffer;
- /* if someone is sending us data, just throw it away */
- if (inout)
- return length;
- /* lock the data structures */
- down(&us_list_semaphore);
- /* find our data from hostno */
- us = us_list;
- while (us) {
- if (us->host_no == hostno)
- break;
- us = us->next;
- }
- /* release our lock on the data structures */
- up(&us_list_semaphore);
- /* if we couldn't find it, we return an error */
- if (!us) {
- return -ESRCH;
- }
- /* print the controller name */
- SPRINTF(" Host scsi%d: usb-storagen", hostno);
- /* print product, vendor, and serial number strings */
- SPRINTF(" Vendor: %sn", us->vendor);
- SPRINTF(" Product: %sn", us->product);
- SPRINTF("Serial Number: %sn", us->serial);
- /* show the protocol and transport */
- SPRINTF(" Protocol: %sn", us->protocol_name);
- SPRINTF(" Transport: %sn", us->transport_name);
- /* show the GUID of the device */
- SPRINTF(" GUID: " GUID_FORMAT "n", GUID_ARGS(us->guid));
- SPRINTF(" Attached: %sn", us->pusb_dev ? "Yes" : "No");
- /*
- * Calculate start of next buffer, and return value.
- */
- *start = buffer + offset;
- if ((pos - buffer) < offset)
- return (0);
- else if ((pos - buffer - offset) < length)
- return (pos - buffer - offset);
- else
- return (length);
- }
- /*
- * this defines our 'host'
- */
- Scsi_Host_Template usb_stor_host_template = {
- name: "usb-storage",
- proc_info: proc_info,
- info: host_info,
- detect: detect,
- release: release,
- command: command,
- queuecommand: queuecommand,
- eh_abort_handler: command_abort,
- eh_device_reset_handler:device_reset,
- eh_bus_reset_handler: bus_reset,
- eh_host_reset_handler: host_reset,
- can_queue: 1,
- this_id: -1,
- sg_tablesize: SG_ALL,
- cmd_per_lun: 1,
- present: 0,
- unchecked_isa_dma: FALSE,
- use_clustering: TRUE,
- use_new_eh_code: TRUE,
- emulated: TRUE
- };
- unsigned char usb_stor_sense_notready[18] = {
- [0] = 0x70, /* current error */
- [2] = 0x02, /* not ready */
- [5] = 0x0a, /* additional length */
- [10] = 0x04, /* not ready */
- [11] = 0x03 /* manual intervention */
- };
- #define USB_STOR_SCSI_SENSE_HDRSZ 4
- #define USB_STOR_SCSI_SENSE_10_HDRSZ 8
- struct usb_stor_scsi_sense_hdr
- {
- __u8* dataLength;
- __u8* mediumType;
- __u8* devSpecParms;
- __u8* blkDescLength;
- };
- typedef struct usb_stor_scsi_sense_hdr Usb_Stor_Scsi_Sense_Hdr;
- union usb_stor_scsi_sense_hdr_u
- {
- Usb_Stor_Scsi_Sense_Hdr hdr;
- __u8* array[USB_STOR_SCSI_SENSE_HDRSZ];
- };
- typedef union usb_stor_scsi_sense_hdr_u Usb_Stor_Scsi_Sense_Hdr_u;
- struct usb_stor_scsi_sense_hdr_10
- {
- __u8* dataLengthMSB;
- __u8* dataLengthLSB;
- __u8* mediumType;
- __u8* devSpecParms;
- __u8* reserved1;
- __u8* reserved2;
- __u8* blkDescLengthMSB;
- __u8* blkDescLengthLSB;
- };
- typedef struct usb_stor_scsi_sense_hdr_10 Usb_Stor_Scsi_Sense_Hdr_10;
- union usb_stor_scsi_sense_hdr_10_u
- {
- Usb_Stor_Scsi_Sense_Hdr_10 hdr;
- __u8* array[USB_STOR_SCSI_SENSE_10_HDRSZ];
- };
- typedef union usb_stor_scsi_sense_hdr_10_u Usb_Stor_Scsi_Sense_Hdr_10_u;
- void usb_stor_scsiSenseParseBuffer( Scsi_Cmnd* , Usb_Stor_Scsi_Sense_Hdr_u*,
- Usb_Stor_Scsi_Sense_Hdr_10_u*, int* );
- int usb_stor_scsiSense10to6( Scsi_Cmnd* the10 )
- {
- __u8 *buffer=0;
- int outputBufferSize = 0;
- int length=0;
- struct scatterlist *sg = 0;
- int i=0, j=0, element=0;
- Usb_Stor_Scsi_Sense_Hdr_u the6Locations;
- Usb_Stor_Scsi_Sense_Hdr_10_u the10Locations;
- int sb=0,si=0,db=0,di=0;
- int sgLength=0;
- US_DEBUGP("-- converting 10 byte sense data to 6 byten");
- the10->cmnd[0] = the10->cmnd[0] & 0xBF;
- /* Determine buffer locations */
- usb_stor_scsiSenseParseBuffer( the10, &the6Locations, &the10Locations,
- &length );
- /* Work out minimum buffer to output */
- outputBufferSize = *the10Locations.hdr.dataLengthLSB;
- outputBufferSize += USB_STOR_SCSI_SENSE_HDRSZ;
- /* Check to see if we need to trucate the output */
- if ( outputBufferSize > length )
- {
- printk( KERN_WARNING USB_STORAGE
- "Had to truncate MODE_SENSE_10 buffer into MODE_SENSE.n" );
- printk( KERN_WARNING USB_STORAGE
- "outputBufferSize is %d and length is %d.n",
- outputBufferSize, length );
- }
- outputBufferSize = length;
- /* Data length */
- if ( *the10Locations.hdr.dataLengthMSB != 0 ) /* MSB must be zero */
- {
- printk( KERN_WARNING USB_STORAGE
- "Command will be truncated to fit in SENSE6 buffer.n" );
- *the6Locations.hdr.dataLength = 0xff;
- }
- else
- {
- *the6Locations.hdr.dataLength = *the10Locations.hdr.dataLengthLSB;
- }
- /* Medium type and DevSpecific parms */
- *the6Locations.hdr.mediumType = *the10Locations.hdr.mediumType;
- *the6Locations.hdr.devSpecParms = *the10Locations.hdr.devSpecParms;
- /* Block descriptor length */
- if ( *the10Locations.hdr.blkDescLengthMSB != 0 ) /* MSB must be zero */
- {
- printk( KERN_WARNING USB_STORAGE
- "Command will be truncated to fit in SENSE6 buffer.n" );
- *the6Locations.hdr.blkDescLength = 0xff;
- }
- else
- {
- *the6Locations.hdr.blkDescLength = *the10Locations.hdr.blkDescLengthLSB;
- }
- if ( the10->use_sg == 0 )
- {
- buffer = the10->request_buffer;
- /* Copy the rest of the data */
- memmove( &(buffer[USB_STOR_SCSI_SENSE_HDRSZ]),
- &(buffer[USB_STOR_SCSI_SENSE_10_HDRSZ]),
- outputBufferSize - USB_STOR_SCSI_SENSE_HDRSZ );
- /* initialise last bytes left in buffer due to smaller header */
- memset( &(buffer[outputBufferSize
- -(USB_STOR_SCSI_SENSE_10_HDRSZ-USB_STOR_SCSI_SENSE_HDRSZ)]),
- 0,
- USB_STOR_SCSI_SENSE_10_HDRSZ-USB_STOR_SCSI_SENSE_HDRSZ );
- }
- else
- {
- sg = (struct scatterlist *) the10->request_buffer;
- /* scan through this scatterlist and figure out starting positions */
- for ( i=0; i < the10->use_sg; i++)
- {
- sgLength = sg[i].length;
- for ( j=0; j<sgLength; j++ )
- {
- /* get to end of header */
- if ( element == USB_STOR_SCSI_SENSE_HDRSZ )
- {
- db=i;
- di=j;
- }
- if ( element == USB_STOR_SCSI_SENSE_10_HDRSZ )
- {
- sb=i;
- si=j;
- /* we've found both sets now, exit loops */
- j=sgLength;
- i=the10->use_sg;
- }
- element++;
- }
- }
- /* Now we know where to start the copy from */
- element = USB_STOR_SCSI_SENSE_HDRSZ;
- while ( element < outputBufferSize
- -(USB_STOR_SCSI_SENSE_10_HDRSZ-USB_STOR_SCSI_SENSE_HDRSZ) )
- {
- /* check limits */
- if ( sb >= the10->use_sg ||
- si >= sg[sb].length ||
- db >= the10->use_sg ||
- di >= sg[db].length )
- {
- printk( KERN_ERR USB_STORAGE
- "Buffer overrun averted, this shouldn't happen!n" );
- break;
- }
- /* copy one byte */
- sg[db].address[di] = sg[sb].address[si];
- /* get next destination */
- if ( sg[db].length-1 == di )
- {
- db++;
- di=0;
- }
- else
- {
- di++;
- }
- /* get next source */
- if ( sg[sb].length-1 == si )
- {
- sb++;
- si=0;
- }
- else
- {
- si++;
- }
- element++;
- }
- /* zero the remaining bytes */
- while ( element < outputBufferSize )
- {
- /* check limits */
- if ( db >= the10->use_sg ||
- di >= sg[db].length )
- {
- printk( KERN_ERR USB_STORAGE
- "Buffer overrun averted, this shouldn't happen!n" );
- break;
- }
- sg[db].address[di] = 0;
- /* get next destination */
- if ( sg[db].length-1 == di )
- {
- db++;
- di=0;
- }
- else
- {
- di++;
- }
- element++;
- }
- }
- /* All done any everything was fine */
- return 0;
- }
- int usb_stor_scsiSense6to10( Scsi_Cmnd* the6 )
- {
- /* will be used to store part of buffer */
- __u8 tempBuffer[USB_STOR_SCSI_SENSE_10_HDRSZ-USB_STOR_SCSI_SENSE_HDRSZ],
- *buffer=0;
- int outputBufferSize = 0;
- int length=0;
- struct scatterlist *sg = 0;
- int i=0, j=0, element=0;
- Usb_Stor_Scsi_Sense_Hdr_u the6Locations;
- Usb_Stor_Scsi_Sense_Hdr_10_u the10Locations;
- int sb=0,si=0,db=0,di=0;
- int lsb=0,lsi=0,ldb=0,ldi=0;
- US_DEBUGP("-- converting 6 byte sense data to 10 byten");
- the6->cmnd[0] = the6->cmnd[0] | 0x40;
- /* Determine buffer locations */
- usb_stor_scsiSenseParseBuffer( the6, &the6Locations, &the10Locations,
- &length );
- /* Work out minimum buffer to output */
- outputBufferSize = *the6Locations.hdr.dataLength;
- outputBufferSize += USB_STOR_SCSI_SENSE_10_HDRSZ;
- /* Check to see if we need to trucate the output */
- if ( outputBufferSize > length )
- {
- printk( KERN_WARNING USB_STORAGE
- "Had to truncate MODE_SENSE into MODE_SENSE_10 buffer.n" );
- printk( KERN_WARNING USB_STORAGE
- "outputBufferSize is %d and length is %d.n",
- outputBufferSize, length );
- }
- outputBufferSize = length;
- /* Block descriptor length - save these before overwriting */
- tempBuffer[2] = *the10Locations.hdr.blkDescLengthMSB;
- tempBuffer[3] = *the10Locations.hdr.blkDescLengthLSB;
- *the10Locations.hdr.blkDescLengthLSB = *the6Locations.hdr.blkDescLength;
- *the10Locations.hdr.blkDescLengthMSB = 0;
- /* reserved - save these before overwriting */
- tempBuffer[0] = *the10Locations.hdr.reserved1;
- tempBuffer[1] = *the10Locations.hdr.reserved2;
- *the10Locations.hdr.reserved1 = *the10Locations.hdr.reserved2 = 0;
- /* Medium type and DevSpecific parms */
- *the10Locations.hdr.devSpecParms = *the6Locations.hdr.devSpecParms;
- *the10Locations.hdr.mediumType = *the6Locations.hdr.mediumType;
- /* Data length */
- *the10Locations.hdr.dataLengthLSB = *the6Locations.hdr.dataLength;
- *the10Locations.hdr.dataLengthMSB = 0;
- if ( !the6->use_sg )
- {
- buffer = the6->request_buffer;
- /* Copy the rest of the data */
- memmove( &(buffer[USB_STOR_SCSI_SENSE_10_HDRSZ]),
- &(buffer[USB_STOR_SCSI_SENSE_HDRSZ]),
- outputBufferSize-USB_STOR_SCSI_SENSE_10_HDRSZ );
- /* Put the first four bytes (after header) in place */
- memcpy( &(buffer[USB_STOR_SCSI_SENSE_10_HDRSZ]),
- tempBuffer,
- USB_STOR_SCSI_SENSE_10_HDRSZ-USB_STOR_SCSI_SENSE_HDRSZ );
- }
- else
- {
- sg = (struct scatterlist *) the6->request_buffer;
- /* scan through this scatterlist and figure out ending positions */
- for ( i=0; i < the6->use_sg; i++)
- {
- for ( j=0; j<sg[i].length; j++ )
- {
- /* get to end of header */
- if ( element == USB_STOR_SCSI_SENSE_HDRSZ )
- {
- ldb=i;
- ldi=j;
- }
- if ( element == USB_STOR_SCSI_SENSE_10_HDRSZ )
- {
- lsb=i;
- lsi=j;
- /* we've found both sets now, exit loops */
- j=sg[i].length;
- i=the6->use_sg;
- break;
- }
- element++;
- }
- }
- /* scan through this scatterlist and figure out starting positions */
- element = length-1;
- /* destination is the last element */
- db=the6->use_sg-1;
- di=sg[db].length-1;
- for ( i=the6->use_sg-1; i >= 0; i--)
- {
- for ( j=sg[i].length-1; j>=0; j-- )
- {
- /* get to end of header and find source for copy */
- if ( element == length - 1
- - (USB_STOR_SCSI_SENSE_10_HDRSZ-USB_STOR_SCSI_SENSE_HDRSZ) )
- {
- sb=i;
- si=j;
- /* we've found both sets now, exit loops */
- j=-1;
- i=-1;
- }
- element--;
- }
- }
- /* Now we know where to start the copy from */
- element = length-1
- - (USB_STOR_SCSI_SENSE_10_HDRSZ-USB_STOR_SCSI_SENSE_HDRSZ);
- while ( element >= USB_STOR_SCSI_SENSE_10_HDRSZ )
- {
- /* check limits */
- if ( ( sb <= lsb && si < lsi ) ||
- ( db <= ldb && di < ldi ) )
- {
- printk( KERN_ERR USB_STORAGE
- "Buffer overrun averted, this shouldn't happen!n" );
- break;
- }
- /* copy one byte */
- sg[db].address[di] = sg[sb].address[si];
- /* get next destination */
- if ( di == 0 )
- {
- db--;
- di=sg[db].length-1;
- }
- else
- {
- di--;
- }
- /* get next source */
- if ( si == 0 )
- {
- sb--;
- si=sg[sb].length-1;
- }
- else
- {
- si--;
- }
- element--;
- }
- /* copy the remaining four bytes */
- while ( element >= USB_STOR_SCSI_SENSE_HDRSZ )
- {
- /* check limits */
- if ( db <= ldb && di < ldi )
- {
- printk( KERN_ERR USB_STORAGE
- "Buffer overrun averted, this shouldn't happen!n" );
- break;
- }
- sg[db].address[di] = tempBuffer[element-USB_STOR_SCSI_SENSE_HDRSZ];
- /* get next destination */
- if ( di == 0 )
- {
- db--;
- di=sg[db].length-1;
- }
- else
- {
- di--;
- }
- element--;
- }
- }
- /* All done and everything was fine */
- return 0;
- }
- void usb_stor_scsiSenseParseBuffer( Scsi_Cmnd* srb, Usb_Stor_Scsi_Sense_Hdr_u* the6,
- Usb_Stor_Scsi_Sense_Hdr_10_u* the10,
- int* length_p )
- {
- int i = 0, j=0, element=0;
- struct scatterlist *sg = 0;
- int length = 0;
- __u8* buffer=0;
- /* are we scatter-gathering? */
- if ( srb->use_sg != 0 )
- {
- /* loop over all the scatter gather structures and
- * get pointer to the data members in the headers
- * (also work out the length while we're here)
- */
- sg = (struct scatterlist *) srb->request_buffer;
- for (i = 0; i < srb->use_sg; i++)
- {
- length += sg[i].length;
- /* We only do the inner loop for the headers */
- if ( element < USB_STOR_SCSI_SENSE_10_HDRSZ )
- {
- /* scan through this scatterlist */
- for ( j=0; j<sg[i].length; j++ )
- {
- if ( element < USB_STOR_SCSI_SENSE_HDRSZ )
- {
- /* fill in the pointers for both header types */
- the6->array[element] = &(sg[i].address[j]);
- the10->array[element] = &(sg[i].address[j]);
- }
- else if ( element < USB_STOR_SCSI_SENSE_10_HDRSZ )
- {
- /* only the longer headers still cares now */
- the10->array[element] = &(sg[i].address[j]);
- }
- /* increase element counter */
- element++;
- }
- }
- }
- }
- else
- {
- length = srb->request_bufflen;
- buffer = srb->request_buffer;
- if ( length < USB_STOR_SCSI_SENSE_10_HDRSZ )
- printk( KERN_ERR USB_STORAGE
- "Buffer length smaller than header!!" );
- for( i=0; i<USB_STOR_SCSI_SENSE_10_HDRSZ; i++ )
- {
- if ( i < USB_STOR_SCSI_SENSE_HDRSZ )
- {
- the6->array[i] = &(buffer[i]);
- the10->array[i] = &(buffer[i]);
- }
- else
- {
- the10->array[i] = &(buffer[i]);
- }
- }
- }
- /* Set value of length passed in */
- *length_p = length;
- }