rt2x00: Fix BUG on rt2800usb when trying to read eFuse EEPROM.

Current tree hits a BUG_ON in rt2x00_regbusy_read, because the eFuse EEPROM
reading code of rt2800lib uses the function without the csr_mutex locked.

Fix this by locking the csr_mutex for the of the EEPROM reading cycly and
using the _lock variants of the register reading and writing functions.

This also introcudes the register_read_lock function pointer in the
rt2800_ops structure.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2800lib.h b/drivers/net/wireless/rt2x00/rt2800lib.h
index 7c790118999b..535ce22f2ac8 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.h
+++ b/drivers/net/wireless/rt2x00/rt2800lib.h
@@ -23,6 +23,8 @@
 struct rt2800_ops {
         void (*register_read)(struct rt2x00_dev *rt2x00dev,
                               const unsigned int offset, u32 *value);
+        void (*register_read_lock)(struct rt2x00_dev *rt2x00dev,
+                                   const unsigned int offset, u32 *value);
         void (*register_write)(struct rt2x00_dev *rt2x00dev,
                                const unsigned int offset, u32 value);
         void (*register_write_lock)(struct rt2x00_dev *rt2x00dev,
@@ -49,6 +51,15 @@ static inline void rt2800_register_read(struct rt2x00_dev *rt2x00dev,
         rt2800ops->register_read(rt2x00dev, offset, value);
 }
 
+static inline void rt2800_register_read_lock(struct rt2x00_dev *rt2x00dev,
+                                             const unsigned int offset,
+                                             u32 *value)
+{
+        const struct rt2800_ops *rt2800ops = rt2x00dev->priv;
+
+        rt2800ops->register_read_lock(rt2x00dev, offset, value);
+}
+
 static inline void rt2800_register_write(struct rt2x00_dev *rt2x00dev,
                                          const unsigned int offset,
                                          u32 value)