wimax/i2400m: add reason argument to i2400m_dev_reset_handle()

In preparation for reset_resume support, in which the same code path
is going to be used, add a diagnostic message to dev_reset_handle()
that can be used to distinguish how the device got there.

This uses the new payload argument added to i2400m_schedule_work() by
the previous commit.

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

4 files changed, 22 insertions, 11 deletions

diff --git a/drivers/net/wimax/i2400m/driver.c b/drivers/net/wimax/i2400m/driver.c
index 5803a2bfd6af..f07d8527b03b 100644
--- a/drivers/net/wimax/i2400m/driver.c
+++ b/drivers/net/wimax/i2400m/driver.c
@@ -573,18 +573,28 @@ void i2400m_dev_stop(struct i2400m *i2400m)
  *       _stop()], don't do anything, let it fail and handle it.
  *
  * This function is ran always in a thread context
+ *
+ * This function gets passed, as payload to i2400m_work() a 'const
+ * char *' ptr with a "reason" why the reset happened (for messages).
  */
 static
 void __i2400m_dev_reset_handle(struct work_struct *ws)
 {
         int result;
         struct i2400m_work *iw = container_of(ws, struct i2400m_work, ws);
+        const char *reason;
         struct i2400m *i2400m = iw->i2400m;
         struct device *dev = i2400m_dev(i2400m);
         enum wimax_st wimax_state;
         struct i2400m_reset_ctx *ctx = i2400m->reset_ctx;
 
-        d_fnstart(3, dev, "(ws %p i2400m %p)\n", ws, i2400m);
+        if (WARN_ON(iw->pl_size != sizeof(reason)))
+                reason = "SW BUG: reason n/a";
+        else
+                memcpy(&reason, iw->pl, sizeof(reason));
+
+        d_fnstart(3, dev, "(ws %p i2400m %p reason %s)\n", ws, i2400m, reason);
+
         result = 0;
         if (mutex_trylock(&i2400m->init_mutex) == 0) {
                 /* We are still in i2400m_dev_start() [let it fail] or
@@ -597,17 +607,17 @@ void __i2400m_dev_reset_handle(struct work_struct *ws)
         }
         wimax_state = wimax_state_get(&i2400m->wimax_dev);
         if (wimax_state < WIMAX_ST_UNINITIALIZED) {
-                dev_info(dev, "device rebooted: it is down, ignoring\n");
+                dev_info(dev, "%s: it is down, ignoring\n", reason);
                 goto out_unlock;        /* ifconfig up/down wasn't called */
         }
-        dev_err(dev, "device rebooted: reinitializing driver\n");
+        dev_err(dev, "%s: reinitializing driver\n", reason);
         __i2400m_dev_stop(i2400m);
         i2400m->updown = 0;
         result = __i2400m_dev_start(i2400m,
                                     I2400M_BRI_SOFT | I2400M_BRI_MAC_REINIT);
         if (result < 0) {
-                dev_err(dev, "device reboot: cannot start the device: %d\n",
-                        result);
+                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;
@@ -622,7 +632,8 @@ out_unlock:
 out:
         i2400m_put(i2400m);
         kfree(iw);
-        d_fnend(3, dev, "(ws %p i2400m %p) = void\n", ws, i2400m);
+        d_fnend(3, dev, "(ws %p i2400m %p reason %s) = void\n",
+                ws, i2400m, reason);
         return;
 }
 
@@ -639,12 +650,12 @@ out:
  * reinitializing the driver to handle the reset, calling into the
  * bus-specific functions ops as needed.
  */
-int i2400m_dev_reset_handle(struct i2400m *i2400m)
+int i2400m_dev_reset_handle(struct i2400m *i2400m, const char *reason)
 {
         i2400m->boot_mode = 1;
         wmb();          /* Make sure i2400m_msg_to_dev() sees boot_mode */
         return i2400m_schedule_work(i2400m, __i2400m_dev_reset_handle,
-                                    GFP_ATOMIC, NULL, 0);
+                                    GFP_ATOMIC, &reason, sizeof(reason));
 }
 EXPORT_SYMBOL_GPL(i2400m_dev_reset_handle);
 
diff --git a/drivers/net/wimax/i2400m/i2400m.h b/drivers/net/wimax/i2400m/i2400m.h
index 700f87be4acf..0c165de89b2d 100644
--- a/drivers/net/wimax/i2400m/i2400m.h
+++ b/drivers/net/wimax/i2400m/i2400m.h
@@ -739,7 +739,7 @@ void i2400m_put(struct i2400m *i2400m)
         dev_put(i2400m->wimax_dev.net_dev);
 }
 
-extern int i2400m_dev_reset_handle(struct i2400m *);
+extern int i2400m_dev_reset_handle(struct i2400m *, const char *);
 extern int i2400m_bm_buf_alloc(struct i2400m *i2400m);
 extern void i2400m_bm_buf_free(struct i2400m *i2400m);
 
diff --git a/drivers/net/wimax/i2400m/sdio-rx.c b/drivers/net/wimax/i2400m/sdio-rx.c
index 87263be4eedb..98ee7fdfd621 100644
--- a/drivers/net/wimax/i2400m/sdio-rx.c
+++ b/drivers/net/wimax/i2400m/sdio-rx.c
@@ -179,7 +179,7 @@ void i2400ms_rx(struct i2400ms *i2400ms)
                 i2400m_rx(i2400m, skb);
         } else if (unlikely(i2400m_is_boot_barker(i2400m,
                                                   skb->data, rx_size))) {
-                ret = i2400m_dev_reset_handle(i2400m);
+                ret = i2400m_dev_reset_handle(i2400m, "device rebooted");
                 dev_err(dev, "RX: SDIO reboot barker\n");
                 kfree_skb(skb);
         } else {
diff --git a/drivers/net/wimax/i2400m/usb-notif.c b/drivers/net/wimax/i2400m/usb-notif.c
index a0751a347cdc..f88d1c6e35cb 100644
--- a/drivers/net/wimax/i2400m/usb-notif.c
+++ b/drivers/net/wimax/i2400m/usb-notif.c
@@ -98,7 +98,7 @@ int i2400mu_notification_grok(struct i2400mu *i2400mu, const void *buf,
         }
         ret = i2400m_is_boot_barker(i2400m, buf, buf_len);
         if (unlikely(ret >= 0))
-                ret = i2400m_dev_reset_handle(i2400m);
+                ret = i2400m_dev_reset_handle(i2400m, "device rebooted");
         else    /* Unknown or unexpected data in the notif message */
                 i2400m_unknown_barker(i2400m, buf, buf_len);
 error_bad_size: