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usb/uas: use scsi_host_find_tag() to find command from a tag

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In "usb/uas: use unique tags for all LUNs" we make sure to create unique
tags across all LUNs. This patch uses scsi_host_find_tag() to obtain the
correct command which is associated with the tag.
The following changes are required:
- don't use sdev->current_cmnd anymore
  Since we can have devices which don't support command queueing we must
  ensure that we can tell the two commands apart. Even if a device
  supports comand queuing we send the INQUIRY command "untagged" for
  LUN1 while we can send a tagged command to LUN0 at the same time.
  devinfo->cmnd is used for stashing the one "untagged" command.
- tag number is altered. If stream support is used then the tag number
  must match the stream number. Therefore we can't use tag 0 and must
  start at tag 1.
  In case we have untagged commands (at least the first command) we must
  be able to distinguish between command tag 0 (which becomes 1) and
  untagged command (which becomes curently also 1).
  The following tag numbers are used:
  0: never
  1: for untagged commands (devinfo->cmnd)
  2+: tagged commands.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2011-12-19 20:22:39 +01:00
parent dae51546b6
commit 22188f4a93
1 changed files with 17 additions and 16 deletions
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33
drivers/usb/storage/uas.c
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@ -98,6 +98,7 @@ struct uas_dev_info {
unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
unsigned use_streams:1;
unsigned uas_sense_old:1;
struct scsi_cmnd *cmnd;
};
enum {
@ -178,8 +179,6 @@ static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
}
cmnd->result = sense_iu->status;
if (sdev->current_cmnd)
sdev->current_cmnd = NULL;
cmnd->scsi_done(cmnd);
usb_free_urb(urb);
}
@ -205,8 +204,6 @@ static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
}
cmnd->result = sense_iu->status;
if (sdev->current_cmnd)
sdev->current_cmnd = NULL;
cmnd->scsi_done(cmnd);
usb_free_urb(urb);
}
@ -230,8 +227,8 @@ static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
static void uas_stat_cmplt(struct urb *urb)
{
struct iu *iu = urb->transfer_buffer;
struct scsi_device *sdev = urb->context;
struct uas_dev_info *devinfo = sdev->hostdata;
struct Scsi_Host *shost = urb->context;
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
struct scsi_cmnd *cmnd;
u16 tag;
@ -242,10 +239,10 @@ static void uas_stat_cmplt(struct urb *urb)
}
tag = be16_to_cpup(&iu->tag) - 1;
if (sdev->current_cmnd)
cmnd = sdev->current_cmnd;
if (tag == 0)
cmnd = devinfo->cmnd;
else
cmnd = scsi_find_tag(sdev, tag);
cmnd = scsi_host_find_tag(shost, tag - 1);
if (!cmnd) {
usb_free_urb(urb);
return;
@ -253,6 +250,9 @@ static void uas_stat_cmplt(struct urb *urb)
switch (iu->iu_id) {
case IU_ID_STATUS:
if (devinfo->cmnd == cmnd)
devinfo->cmnd = NULL;
if (urb->actual_length < 16)
devinfo->uas_sense_old = 1;
if (devinfo->uas_sense_old)
@ -314,7 +314,7 @@ static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
goto free;
usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
uas_stat_cmplt, cmnd->device);
uas_stat_cmplt, cmnd->device->host);
urb->stream_id = stream_id;
urb->transfer_flags |= URB_FREE_BUFFER;
out:
@ -346,7 +346,7 @@ static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
iu->iu_id = IU_ID_COMMAND;
if (blk_rq_tagged(cmnd->request))
iu->tag = cpu_to_be16(cmnd->request->tag + 1);
iu->tag = cpu_to_be16(cmnd->request->tag + 2);
else
iu->tag = cpu_to_be16(1);
iu->prio_attr = UAS_SIMPLE_TAG;
@ -458,13 +458,13 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
if (!cmdinfo->status_urb && sdev->current_cmnd)
if (devinfo->cmnd)
return SCSI_MLQUEUE_DEVICE_BUSY;
if (blk_rq_tagged(cmnd->request)) {
cmdinfo->stream = cmnd->request->tag + 1;
cmdinfo->stream = cmnd->request->tag + 2;
} else {
sdev->current_cmnd = cmnd;
devinfo->cmnd = cmnd;
cmdinfo->stream = 1;
}
@ -565,7 +565,7 @@ static int uas_slave_configure(struct scsi_device *sdev)
{
struct uas_dev_info *devinfo = sdev->hostdata;
scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
scsi_activate_tcq(sdev, devinfo->qdepth - 1);
scsi_activate_tcq(sdev, devinfo->qdepth - 2);
return 0;
}
@ -633,6 +633,7 @@ static void uas_configure_endpoints(struct uas_dev_info *devinfo)
unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
devinfo->uas_sense_old = 0;
devinfo->cmnd = NULL;
for (i = 0; i < n_endpoints; i++) {
unsigned char *extra = endpoint[i].extra;
@ -728,7 +729,7 @@ static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
devinfo->udev = udev;
uas_configure_endpoints(devinfo);
result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 1);
result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
if (result)
goto free;