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| author | Oliver O'Halloran <oohall@gmail.com> | 2017-05-16 17:20:37 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-05-19 09:22:57 +1000 |
| commit | bb192fd55ffb20d619101c5e3e1f4fd24f844d11 (patch) | |
| tree | 432c6db801d96c9269244f67fafe1b056e6ce543 /hw/p8-i2c.c | |
| parent | 40cf5a391a80a75f8827d2427e49a92e73871b00 (diff) | |
| download | skiboot-bb192fd55ffb20d619101c5e3e1f4fd24f844d11.zip skiboot-bb192fd55ffb20d619101c5e3e1f4fd24f844d11.tar.gz skiboot-bb192fd55ffb20d619101c5e3e1f4fd24f844d11.tar.bz2 | |
hw/i2c: Fix early lock drop
When interacting with an I2C master the p8-i2c driver (common to p9)
aquires a per-master lock which it holds for the duration of it's
interaction with the master. Unfortunately, when
p8_i2c_check_initial_status() detects that the master is busy with
another transaction it drops the lock and returns OPAL_BUSY. This is
contrary to the driver's locking strategy which requires that the
caller aquire and drop the lock. This leads to a crash due to the
double unlock(), which skiboot treats as fatal.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'hw/p8-i2c.c')
| -rw-r--r-- | hw/p8-i2c.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/hw/p8-i2c.c b/hw/p8-i2c.c index 3bce0b1..fefc1d4 100644 --- a/hw/p8-i2c.c +++ b/hw/p8-i2c.c @@ -990,7 +990,6 @@ static int p8_i2c_check_initial_status(struct p8_i2c_master_port *port) /* Delay 5ms for bus to settle */ schedule_timer(&master->recovery, msecs_to_tb(5)); - unlock(&master->lock); return OPAL_BUSY; } @@ -1010,7 +1009,6 @@ static int p8_i2c_check_initial_status(struct p8_i2c_master_port *port) /* Delay 5ms for bus to settle */ schedule_timer(&master->recovery, msecs_to_tb(5)); - unlock(&master->lock); return OPAL_BUSY; } |