1 files changed, 29 insertions, 7 deletions

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index b42ae6bfb12b..81ba14c73dc7 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -1337,7 +1337,9 @@ struct iso_context {
         unsigned                pending;
         spinlock_t              lock;
         struct completion       done;
+        int                     submit_error;
         unsigned long           errors;
+        unsigned long           packet_count;
         struct usbtest_dev      *dev;
 };
 
@@ -1348,10 +1350,14 @@ static void iso_callback (struct urb *urb, struct pt_regs *regs)
         spin_lock(&ctx->lock);
         ctx->count--;
 
+        ctx->packet_count += urb->number_of_packets;
         if (urb->error_count > 0)
                 ctx->errors += urb->error_count;
+        else if (urb->status != 0)
+                ctx->errors += urb->number_of_packets;
 
-        if (urb->status == 0 && ctx->count > (ctx->pending - 1)) {
+        if (urb->status == 0 && ctx->count > (ctx->pending - 1)
+                        && !ctx->submit_error) {
                 int status = usb_submit_urb (urb, GFP_ATOMIC);
                 switch (status) {
                 case 0:
@@ -1362,6 +1368,8 @@ static void iso_callback (struct urb *urb, struct pt_regs *regs)
                                         status);
                         /* FALLTHROUGH */
                 case -ENODEV:                   /* disconnected */
+                case -ESHUTDOWN:                /* endpoint disabled */
+                        ctx->submit_error = 1;
                         break;
                 }
         }
@@ -1371,8 +1379,8 @@ static void iso_callback (struct urb *urb, struct pt_regs *regs)
         if (ctx->pending == 0) {
                 if (ctx->errors)
                         dev_dbg (&ctx->dev->intf->dev,
-                                "iso test, %lu errors\n",
-                                ctx->errors);
+                                "iso test, %lu errors out of %lu\n",
+                                ctx->errors, ctx->packet_count);
                 complete (&ctx->done);
         }
 done:
@@ -1433,15 +1441,14 @@ test_iso_queue (struct usbtest_dev *dev, struct usbtest_param *param,
         struct usb_device       *udev;
         unsigned                i;
         unsigned long           packets = 0;
-        int                     status;
+        int                     status = 0;
         struct urb              *urbs[10];      /* FIXME no limit */
 
         if (param->sglen > 10)
                 return -EDOM;
 
+        memset(&context, 0, sizeof context);
         context.count = param->iterations * param->sglen;
-        context.pending = param->sglen;
-        context.errors = 0;
         context.dev = dev;
         init_completion (&context.done);
         spin_lock_init (&context.lock);
@@ -1473,6 +1480,7 @@ test_iso_queue (struct usbtest_dev *dev, struct usbtest_param *param,
 
         spin_lock_irq (&context.lock);
         for (i = 0; i < param->sglen; i++) {
+                ++context.pending;
                 status = usb_submit_urb (urbs [i], SLAB_ATOMIC);
                 if (status < 0) {
                         ERROR (dev, "submit iso[%d], error %d\n", i, status);
@@ -1483,12 +1491,26 @@ test_iso_queue (struct usbtest_dev *dev, struct usbtest_param *param,
 
                         simple_free_urb (urbs [i]);
                         context.pending--;
+                        context.submit_error = 1;
+                        break;
                 }
         }
         spin_unlock_irq (&context.lock);
 
         wait_for_completion (&context.done);
-        return 0;
+
+        /*
+         * Isochronous transfers are expected to fail sometimes.  As an
+         * arbitrary limit, we will report an error if any submissions
+         * fail or if the transfer failure rate is > 10%.
+         */
+        if (status != 0)
+                ;
+        else if (context.submit_error)
+                status = -EACCES;
+        else if (context.errors > context.packet_count / 10)
+                status = -EIO;
+        return status;
 
 fail:
         for (i = 0; i < param->sglen; i++) {