diff options
| author | Gertjan van Wingerde <gwingerde@gmail.com> | 2009-11-14 20:20:36 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-11-16 14:17:12 -0500 |
| commit | 31a4cf1f22677ba1ea90be055bc20aac25b8e7c4 (patch) | |
| tree | 8432c39f519d86bff3e2793db7478cd31f59c6c6 /drivers/net/wireless/rt2x00/rt2800lib.c | |
| parent | 16475b095a9c952f16e626c142b30bc95cfeadb3 (diff) | |
| download | lwn-31a4cf1f22677ba1ea90be055bc20aac25b8e7c4.tar.gz lwn-31a4cf1f22677ba1ea90be055bc20aac25b8e7c4.zip | |
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>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2800lib.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2800lib.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c index c7108050af3a..621dac18ca6c 100644 --- a/drivers/net/wireless/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/rt2x00/rt2800lib.c @@ -1684,24 +1684,28 @@ static void rt2800_efuse_read(struct rt2x00_dev *rt2x00dev, unsigned int i) { u32 reg; - rt2800_register_read(rt2x00dev, EFUSE_CTRL, ®); + mutex_lock(&rt2x00dev->csr_mutex); + + rt2800_register_read_lock(rt2x00dev, EFUSE_CTRL, ®); rt2x00_set_field32(®, EFUSE_CTRL_ADDRESS_IN, i); rt2x00_set_field32(®, EFUSE_CTRL_MODE, 0); rt2x00_set_field32(®, 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, ®); /* 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) |