usb/uas: one only one status URB/host on stream-less connection
The status/sense URB is allocated on per-command basis. A read/write
looks the following way on a stream-less connection:
- send cmd tag X, queue status
- receive status, oh it is a read for tag X. queue status & read
- receive read
- receive status, oh I'm done for tag X. Cool call complete and free
status urb.
This block repeats itself 1:1 for further commands and looks great so
far. Lets take a look now what happens if we do allow multiple commands:
- send cmd tag X, queue statusX (belongs to the command with the X tag)
- send cmd tag Y, queue statusY (belongs to the command with the Y tag)
- receive statusX, oh it is a read for tag X. queue statusX & a read
- receive read
- receive statusY, oh I'm done for tag X. Cool call complete and free statusY.
- receive statusX, oh it is a read for tag Y. queue statusY & before we
queue the read the the following message can be observed:
|sd 0:0:0:0: [sda] sense urb submission failure
followed by a second attempt with the same result.
In order to address this problem we will use only one status URB for
each scsi host in case we don't have stream support (as suggested by
Matthew). This URB is requeued until the device removed. Nothing changes
on stream based endpoints.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index e2386e8..036e969 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -99,6 +99,7 @@
unsigned use_streams:1;
unsigned uas_sense_old:1;
struct scsi_cmnd *cmnd;
+ struct urb *status_urb; /* used only if stream support is available */
};
enum {
@@ -117,6 +118,7 @@
unsigned int state;
unsigned int stream;
struct urb *cmd_urb;
+ /* status_urb is used only if stream support isn't available */
struct urb *status_urb;
struct urb *data_in_urb;
struct urb *data_out_urb;
@@ -180,7 +182,6 @@
cmnd->result = sense_iu->status;
cmnd->scsi_done(cmnd);
- usb_free_urb(urb);
}
static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
@@ -205,7 +206,6 @@
cmnd->result = sense_iu->status;
cmnd->scsi_done(cmnd);
- usb_free_urb(urb);
}
static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
@@ -214,7 +214,7 @@
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
int err;
- cmdinfo->state = direction | SUBMIT_STATUS_URB;
+ cmdinfo->state = direction;
err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
if (err) {
spin_lock(&uas_work_lock);
@@ -231,10 +231,12 @@
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
struct scsi_cmnd *cmnd;
u16 tag;
+ int ret;
if (urb->status) {
dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
- usb_free_urb(urb);
+ if (devinfo->use_streams)
+ usb_free_urb(urb);
return;
}
@@ -244,7 +246,13 @@
else
cmnd = scsi_host_find_tag(shost, tag - 1);
if (!cmnd) {
- usb_free_urb(urb);
+ if (devinfo->use_streams) {
+ usb_free_urb(urb);
+ return;
+ }
+ ret = usb_submit_urb(urb, GFP_ATOMIC);
+ if (ret)
+ dev_err(&urb->dev->dev, "failed submit status urb\n");
return;
}
@@ -270,6 +278,15 @@
scmd_printk(KERN_ERR, cmnd,
"Bogus IU (%d) received on status pipe\n", iu->iu_id);
}
+
+ if (devinfo->use_streams) {
+ usb_free_urb(urb);
+ return;
+ }
+
+ ret = usb_submit_urb(urb, GFP_ATOMIC);
+ if (ret)
+ dev_err(&urb->dev->dev, "failed submit status urb\n");
}
static void uas_data_cmplt(struct urb *urb)
@@ -300,7 +317,7 @@
}
static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
- struct scsi_cmnd *cmnd, u16 stream_id)
+ struct Scsi_Host *shost, u16 stream_id)
{
struct usb_device *udev = devinfo->udev;
struct urb *urb = usb_alloc_urb(0, gfp);
@@ -314,7 +331,7 @@
goto free;
usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
- uas_stat_cmplt, cmnd->device->host);
+ uas_stat_cmplt, shost);
urb->stream_id = stream_id;
urb->transfer_flags |= URB_FREE_BUFFER;
out:
@@ -376,8 +393,8 @@
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
if (cmdinfo->state & ALLOC_STATUS_URB) {
- cmdinfo->status_urb = uas_alloc_sense_urb(devinfo, gfp, cmnd,
- cmdinfo->stream);
+ cmdinfo->status_urb = uas_alloc_sense_urb(devinfo, gfp,
+ cmnd->device->host, cmdinfo->stream);
if (!cmdinfo->status_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_STATUS_URB;
@@ -486,7 +503,8 @@
}
if (!devinfo->use_streams) {
- cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
+ cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB |
+ ALLOC_STATUS_URB | SUBMIT_STATUS_URB);
cmdinfo->stream = 0;
}
@@ -685,6 +703,29 @@
}
}
+static int uas_alloc_status_urb(struct uas_dev_info *devinfo,
+ struct Scsi_Host *shost)
+{
+ if (devinfo->use_streams) {
+ devinfo->status_urb = NULL;
+ return 0;
+ }
+
+ devinfo->status_urb = uas_alloc_sense_urb(devinfo, GFP_KERNEL,
+ shost, 0);
+ if (!devinfo->status_urb)
+ goto err_s_urb;
+
+ if (usb_submit_urb(devinfo->status_urb, GFP_KERNEL))
+ goto err_submit_urb;
+
+ return 0;
+err_submit_urb:
+ usb_free_urb(devinfo->status_urb);
+err_s_urb:
+ return -ENOMEM;
+}
+
static void uas_free_streams(struct uas_dev_info *devinfo)
{
struct usb_device *udev = devinfo->udev;
@@ -739,10 +780,17 @@
shost->hostdata[0] = (unsigned long)devinfo;
+ result = uas_alloc_status_urb(devinfo, shost);
+ if (result)
+ goto err_alloc_status;
+
scsi_scan_host(shost);
usb_set_intfdata(intf, shost);
return result;
+err_alloc_status:
+ scsi_remove_host(shost);
+ shost = NULL;
deconfig_eps:
uas_free_streams(devinfo);
free:
@@ -770,6 +818,8 @@
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
scsi_remove_host(shost);
+ usb_kill_urb(devinfo->status_urb);
+ usb_free_urb(devinfo->status_urb);
uas_free_streams(devinfo);
kfree(devinfo);
}