commit 31a4cf1f22677ba1ea90be055bc20aac25b8e7c4
author Gertjan van Wingerde <gwingerde@gmail.com> Sat Nov 14 20:20:36 2009 +0100
committer John W. Linville <linville@tuxdriver.com> Mon Nov 16 14:17:12 2009 -0500
tree 8432c39f519d86bff3e2793db7478cd31f59c6c6
parent 16475b095a9c952f16e626c142b30bc95cfeadb3

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>

drivers/net/wireless/rt2x00/rt2800lib.c

diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index c710805..621dac1 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -1684,24 +1684,28 @@
 {
 	u32 reg;
 
-	rt2800_register_read(rt2x00dev, EFUSE_CTRL, &reg);
+	mutex_lock(&rt2x00dev->csr_mutex);
+
+	rt2800_register_read_lock(rt2x00dev, EFUSE_CTRL, &reg);
 	rt2x00_set_field32(&reg, EFUSE_CTRL_ADDRESS_IN, i);
 	rt2x00_set_field32(&reg, EFUSE_CTRL_MODE, 0);
 	rt2x00_set_field32(&reg, EFUSE_CTRL_KICK, 1);
-	rt2800_register_write(rt2x00dev, EFUSE_CTRL, reg);
+	rt2800_register_write_lock(rt2x00dev, EFUSE_CTRL, reg);
 
 	/* Wait until the EEPROM has been loaded */
 	rt2800_regbusy_read(rt2x00dev, EFUSE_CTRL, EFUSE_CTRL_KICK, &reg);
 
 	/* Apparently the data is read from end to start */
-	rt2800_register_read(rt2x00dev, EFUSE_DATA3,
-				(u32 *)&rt2x00dev->eeprom[i]);
-	rt2800_register_read(rt2x00dev, EFUSE_DATA2,
-				(u32 *)&rt2x00dev->eeprom[i + 2]);
-	rt2800_register_read(rt2x00dev, EFUSE_DATA1,
-				(u32 *)&rt2x00dev->eeprom[i + 4]);
-	rt2800_register_read(rt2x00dev, EFUSE_DATA0,
-				(u32 *)&rt2x00dev->eeprom[i + 6]);
+	rt2800_register_read_lock(rt2x00dev, EFUSE_DATA3,
+					(u32 *)&rt2x00dev->eeprom[i]);
+	rt2800_register_read_lock(rt2x00dev, EFUSE_DATA2,
+					(u32 *)&rt2x00dev->eeprom[i + 2]);
+	rt2800_register_read_lock(rt2x00dev, EFUSE_DATA1,
+					(u32 *)&rt2x00dev->eeprom[i + 4]);
+	rt2800_register_read_lock(rt2x00dev, EFUSE_DATA0,
+					(u32 *)&rt2x00dev->eeprom[i + 6]);
+
+	mutex_unlock(&rt2x00dev->csr_mutex);
 }
 
 void rt2800_read_eeprom_efuse(struct rt2x00_dev *rt2x00dev)