* 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>
#include <linux/module.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_devinfo.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
+#include "scsiglue.h"
+#include "usb.h"
+#include "debug.h"
+#include "transport.h"
+#include "protocol.h"
/***********************************************************************
* Host functions
static int slave_alloc (struct scsi_device *sdev)
{
/*
- * Set default bflags. These can be overridden for individual
- * models and vendors via the scsi devinfo mechanism.
+ * Set the INQUIRY transfer length to 36. We don't use any of
+ * the extra data and many devices choke if asked for more or
+ * less than 36 bytes.
*/
- sdev->sdev_bflags = (BLIST_MS_SKIP_PAGE_08 | BLIST_MS_SKIP_PAGE_3F |
- BLIST_USE_10_BYTE_MS);
+ sdev->inquiry_len = 36;
return 0;
}
* the end, scatter-gather buffers follow page boundaries. */
blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
- /* Devices using Genesys Logic chips cause a lot of trouble for
- * high-speed transfers; they die unpredictably when given more
- * than 64 KB of data at a time. If we detect such a device,
- * reduce the maximum transfer size to 64 KB = 128 sectors. */
+ /* Set the SCSI level to at least 2. We'll leave it at 3 if that's
+ * what is originally reported. We need this to avoid confusing
+ * the SCSI layer with devices that report 0 or 1, but need 10-byte
+ * commands (ala ATAPI devices behind certain bridges, or devices
+ * which simply have broken INQUIRY data).
+ *
+ * NOTE: This means /dev/sg programs (ala cdrecord) will get the
+ * actual information. This seems to be the preference for
+ * programs like that.
+ *
+ * NOTE: This also means that /proc/scsi/scsi and sysfs may report
+ * the actual value or the modified one, depending on where the
+ * data comes from.
+ */
+ if (sdev->scsi_level < SCSI_2)
+ sdev->scsi_level = SCSI_2;
+
+ /* According to the technical support people at Genesys Logic,
+ * devices using their chips have problems transferring more than
+ * 32 KB at a time. In practice people have found that 64 KB
+ * works okay and that's what Windows does. But we'll be
+ * conservative; people can always use the sysfs interface to
+ * increase max_sectors. */
+ if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) == USB_VENDOR_ID_GENESYS &&
+ sdev->request_queue->max_sectors > 64)
+ blk_queue_max_sectors(sdev->request_queue, 64);
+
+ /* We can't put these settings in slave_alloc() because that gets
+ * called before the device type is known. Consequently these
+ * settings can't be overridden via the scsi devinfo mechanism. */
+ if (sdev->type == TYPE_DISK) {
+
+ /* Disk-type devices use MODE SENSE(6) if the protocol
+ * (SubClass) is Transparent SCSI, otherwise they use
+ * MODE SENSE(10). */
+ if (us->subclass != US_SC_SCSI)
+ sdev->use_10_for_ms = 1;
+
+ /* Many disks only accept MODE SENSE transfer lengths of
+ * 192 bytes (that's what Windows uses). */
+ sdev->use_192_bytes_for_3f = 1;
+
+ /* A number of devices have problems with MODE SENSE for
+ * page x08, so we will skip it. */
+ sdev->skip_ms_page_8 = 1;
+
+#ifndef CONFIG_USB_STORAGE_RW_DETECT
+ /* Some devices may not like MODE SENSE with page=0x3f.
+ * Now that we're using 192-byte transfers this may no
+ * longer be a problem. So this will be a configuration
+ * option. */
+ sdev->skip_ms_page_3f = 1;
+#endif
+
+ } else {
-#define USB_VENDOR_ID_GENESYS 0x05e3 // Needs a standard location
- if (us->pusb_dev->descriptor.idVendor == USB_VENDOR_ID_GENESYS &&
- us->pusb_dev->speed == USB_SPEED_HIGH)
- blk_queue_max_sectors(sdev->request_queue, 128);
+ /* Non-disk-type devices don't need to blacklist any pages
+ * or to force 192-byte transfer lengths for MODE SENSE.
+ * But they do need to use MODE SENSE(10). */
+ sdev->use_10_for_ms = 1;
+ }
- /* this is to satisify the compiler, tho I don't think the
+ /* this is to satisfy the compiler, tho I don't think the
* return code is ever checked anywhere. */
return 0;
}
/* queue a command */
/* This is always called with scsi_lock(srb->host) held */
-static int queuecommand( Scsi_Cmnd *srb , void (*done)(Scsi_Cmnd *))
+static int queuecommand(struct scsi_cmnd *srb,
+ void (*done)(struct scsi_cmnd *))
{
struct us_data *us = (struct us_data *)srb->device->host->hostdata[0];
US_DEBUGP("%s called\n", __FUNCTION__);
srb->host_scribble = (unsigned char *)us;
- /* enqueue the command */
- if (us->sm_state != US_STATE_IDLE || us->srb != NULL) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "state = %d, us->srb = %p\n",
- __FUNCTION__, us->sm_state, us->srb);
+ /* check for state-transition errors */
+ if (us->srb != NULL) {
+ printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n",
+ __FUNCTION__, us->srb);
return SCSI_MLQUEUE_HOST_BUSY;
}
+ /* fail the command if we are disconnecting */
+ if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
+ US_DEBUGP("Fail command during disconnect\n");
+ srb->result = DID_NO_CONNECT << 16;
+ done(srb);
+ return 0;
+ }
+
+ /* enqueue the command and wake up the control thread */
srb->scsi_done = done;
us->srb = srb;
-
- /* wake up the process task */
up(&(us->sema));
return 0;
* Error handling functions
***********************************************************************/
-/* Command abort */
+/* Command timeout and abort */
/* This is always called with scsi_lock(srb->host) held */
-static int command_abort( Scsi_Cmnd *srb )
+static int command_abort(struct scsi_cmnd *srb )
{
struct Scsi_Host *host = srb->device->host;
struct us_data *us = (struct us_data *) host->hostdata[0];
return FAILED;
}
- /* Normally the current state is RUNNING. If the control thread
- * hasn't even started processing this command, the state will be
- * IDLE. Anything else is a bug. */
- if (us->sm_state != US_STATE_RUNNING
- && us->sm_state != US_STATE_IDLE) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "invalid state %d\n", __FUNCTION__, us->sm_state);
- return FAILED;
- }
-
- /* Set state to ABORTING and set the ABORTING bit, but only if
+ /* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if
* a device reset isn't already in progress (to avoid interfering
* with the reset). To prevent races with auto-reset, we must
* stop any ongoing USB transfers while still holding the host
* lock. */
- us->sm_state = US_STATE_ABORTING;
+ set_bit(US_FLIDX_TIMED_OUT, &us->flags);
if (!test_bit(US_FLIDX_RESETTING, &us->flags)) {
set_bit(US_FLIDX_ABORTING, &us->flags);
usb_stor_stop_transport(us);
/* Reacquire the lock and allow USB transfers to resume */
scsi_lock(host);
clear_bit(US_FLIDX_ABORTING, &us->flags);
+ clear_bit(US_FLIDX_TIMED_OUT, &us->flags);
return SUCCESS;
}
/* This invokes the transport reset mechanism to reset the state of the
* device */
/* This is always called with scsi_lock(srb->host) held */
-static int device_reset( Scsi_Cmnd *srb )
+static int device_reset(struct scsi_cmnd *srb)
{
struct us_data *us = (struct us_data *)srb->device->host->hostdata[0];
int result;
US_DEBUGP("%s called\n", __FUNCTION__);
- if (us->sm_state != US_STATE_IDLE) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "invalid state %d\n", __FUNCTION__, us->sm_state);
- return FAILED;
- }
- /* set the state and release the lock */
- us->sm_state = US_STATE_RESETTING;
scsi_unlock(srb->device->host);
/* lock the device pointers and do the reset */
result = us->transport_reset(us);
up(&(us->dev_semaphore));
- /* lock access to the state and clear it */
+ /* lock the host for the return */
scsi_lock(srb->device->host);
- us->sm_state = US_STATE_IDLE;
return result;
}
/* It refuses to work if there's more than one interface in
* the device, so that other users are not affected. */
/* This is always called with scsi_lock(srb->host) held */
-static int bus_reset( Scsi_Cmnd *srb )
+static int bus_reset(struct scsi_cmnd *srb)
{
struct us_data *us = (struct us_data *)srb->device->host->hostdata[0];
- int result;
+ int result, rc;
US_DEBUGP("%s called\n", __FUNCTION__);
- if (us->sm_state != US_STATE_IDLE) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "invalid state %d\n", __FUNCTION__, us->sm_state);
- return FAILED;
- }
- /* set the state and release the lock */
- us->sm_state = US_STATE_RESETTING;
scsi_unlock(srb->device->host);
/* The USB subsystem doesn't handle synchronisation between
result = -EBUSY;
US_DEBUGP("Refusing to reset a multi-interface device\n");
} else {
- result = usb_reset_device(us->pusb_dev);
- US_DEBUGP("usb_reset_device returns %d\n", result);
+ rc = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
+ if (rc < 0) {
+ US_DEBUGP("unable to lock device for reset: %d\n", rc);
+ result = rc;
+ } else {
+ result = usb_reset_device(us->pusb_dev);
+ if (rc)
+ usb_unlock_device(us->pusb_dev);
+ US_DEBUGP("usb_reset_device returns %d\n", result);
+ }
}
up(&(us->dev_semaphore));
- /* lock access to the state and clear it */
+ /* lock the host for the return */
scsi_lock(srb->device->host);
- us->sm_state = US_STATE_IDLE;
return result < 0 ? FAILED : SUCCESS;
}
* periodically someone should test to see which setting is more
* optimal.
*/
- .use_clustering = TRUE,
+ .use_clustering = 1,
/* emulated HBA */
- .emulated = TRUE,
+ .emulated = 1,
+
+ /* we do our own delay after a device or bus reset */
+ .skip_settle_delay = 1,
/* sysfs device attributes */
.sdev_attrs = sysfs_device_attr_list,
git://git.onelab.eu / linux-2.6.git / blobdiff