wimax/i2400m: fix deadlock: don't do BUS reset under i2400m->init_mutex

Since the addition of the pre/post reset handlers, it became clear
that we cannot do a I2400M-RT-BUS type reset while holding the
init_mutex, as in the case of USB, it will deadlock when trying to
call i2400m_pre_reset().

Thus, the following changes:

 - clarify the fact that calling bus_reset() w/ I2400M_RT_BUS while
   holding init_mutex is a no-no.

 - i2400m_dev_reset_handle() will do a BUS reset to recover a gone
   device after unlocking init_mutex.

 - in the USB reset implementation, when cold and warm reset fails,
   fallback to QUEUING a usb reset, not executing a USB reset, so it
   happens from another context and does not deadlock.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

3 files changed, 20 insertions, 7 deletions

diff --git a/drivers/net/wimax/i2400m/driver.c b/drivers/net/wimax/i2400m/driver.c
index 810eda7dbdba..10673af5a7f0 100644
--- a/drivers/net/wimax/i2400m/driver.c
+++ b/drivers/net/wimax/i2400m/driver.c
@@ -765,9 +765,7 @@ void __i2400m_dev_reset_handle(struct work_struct *ws)
                 wmb();          /* see i2400m->updown's documentation  */
                 dev_err(dev, "%s: cannot start the device: %d\n",
                         reason, result);
-                result = i2400m->bus_reset(i2400m, I2400M_RT_BUS);
-                if (result >= 0)
-                        result = -ENODEV;
+                result = -EUCLEAN;
         }
 out_unlock:
         if (i2400m->reset_ctx) {
@@ -775,6 +773,12 @@ out_unlock:
                 complete(&ctx->completion);
         }
         mutex_unlock(&i2400m->init_mutex);
+        if (result == -EUCLEAN) {
+                /* ops, need to clean up [w/ init_mutex not held] */
+                result = i2400m->bus_reset(i2400m, I2400M_RT_BUS);
+                if (result >= 0)
+                        result = -ENODEV;
+        }
 out:
         i2400m_put(i2400m);
         kfree(iw);
diff --git a/drivers/net/wimax/i2400m/i2400m.h b/drivers/net/wimax/i2400m/i2400m.h
index 8fc8a0ca5126..f5ed7d5cee47 100644
--- a/drivers/net/wimax/i2400m/i2400m.h
+++ b/drivers/net/wimax/i2400m/i2400m.h
@@ -281,6 +281,9 @@ struct i2400m_barker_db;
  *     process, so it cannot rely on common infrastructure being laid
  *     out.
  *
+ *     IMPORTANT: don't call reset on RT_BUS with i2400m->init_mutex
+ *     held, as the .pre/.post reset handlers will deadlock.
+ *
  * @bus_bm_retries: [fill] How many times shall a firmware upload /
  *     device initialization be retried? Different models of the same
  *     device might need different values, hence it is set by the
diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c
index 8b246cc498b1..418db12b0cd7 100644
--- a/drivers/net/wimax/i2400m/usb.c
+++ b/drivers/net/wimax/i2400m/usb.c
@@ -254,7 +254,6 @@ int i2400mu_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt)
                         sizeof(i2400m_COLD_BOOT_BARKER),
                         i2400mu->endpoint_cfg.reset_cold);
         else if (rt == I2400M_RT_BUS) {
-do_bus_reset:
                 result = usb_reset_device(i2400mu->usb_dev);
                 switch (result) {
                 case 0:
@@ -262,7 +261,7 @@ do_bus_reset:
                 case -ENODEV:
                 case -ENOENT:
                 case -ESHUTDOWN:
-                        result = rt == I2400M_RT_WARM ? -ENODEV : 0;
+                        result = 0;
                         break;  /* We assume the device is disconnected */
                 default:
                         dev_err(dev, "USB reset failed (%d), giving up!\n",
@@ -275,10 +274,17 @@ do_bus_reset:
         if (result < 0
             && result != -EINVAL        /* device is gone */
             && rt != I2400M_RT_BUS) {
+                /*
+                 * Things failed -- resort to lower level reset, that
+                 * we queue in another context; the reason for this is
+                 * that the pre and post reset functionality requires
+                 * the i2400m->init_mutex; RT_WARM and RT_COLD can
+                 * come from areas where i2400m->init_mutex is taken.
+                 */
                 dev_err(dev, "%s reset failed (%d); trying USB reset\n",
                         rt == I2400M_RT_WARM ? "warm" : "cold", result);
-                rt = I2400M_RT_BUS;
-                goto do_bus_reset;
+                usb_queue_reset_device(i2400mu->usb_iface);
+                result = -ENODEV;
         }
         d_fnend(3, dev, "(i2400m %p rt %u) = %d\n", i2400m, rt, result);
         return result;