wimax/i2400m: if a device reboot happens during probe, handle it
When a device reboot happens when we are under probe, with init_mutex
taken, make sure we can recover. Have dev_reset_handle set boot mode
and i2400m_msg_to_dev() will see it and fail gracefully instead of
timing out.
Found and diagnosed by Cindy H. Kao.
Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
diff --git a/drivers/net/wimax/i2400m/control.c b/drivers/net/wimax/i2400m/control.c
index d8e0cdf..f9399f2 100644
--- a/drivers/net/wimax/i2400m/control.c
+++ b/drivers/net/wimax/i2400m/control.c
@@ -695,6 +695,7 @@
d_fnstart(3, dev, "(i2400m %p buf %p len %zu)\n",
i2400m, buf, buf_len);
+ rmb(); /* Make sure we see what i2400m_dev_reset_handle() */
if (i2400m->boot_mode)
return ERR_PTR(-ENODEV);
diff --git a/drivers/net/wimax/i2400m/driver.c b/drivers/net/wimax/i2400m/driver.c
index 897794c..e8d022d 100644
--- a/drivers/net/wimax/i2400m/driver.c
+++ b/drivers/net/wimax/i2400m/driver.c
@@ -610,6 +610,8 @@
*/
int i2400m_dev_reset_handle(struct i2400m *i2400m)
{
+ 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);
}
diff --git a/drivers/net/wimax/i2400m/fw.c b/drivers/net/wimax/i2400m/fw.c
index 26924f1..01c926e 100644
--- a/drivers/net/wimax/i2400m/fw.c
+++ b/drivers/net/wimax/i2400m/fw.c
@@ -985,6 +985,7 @@
d_fnstart(5, dev, "(i2400m %p bcf %p size %zu)\n",
i2400m, bcf, bcf_size);
i2400m->boot_mode = 1;
+ wmb(); /* Make sure other readers see it */
hw_reboot:
if (count-- == 0) {
ret = -ERESTARTSYS;
@@ -1033,6 +1034,7 @@
d_printf(2, dev, "fw %s successfully uploaded\n",
i2400m->fw_name);
i2400m->boot_mode = 0;
+ wmb(); /* Make sure i2400m_msg_to_dev() sees boot_mode */
error_dnload_finalize:
error_dnload_bcf:
error_dnload_init:
