i2c: aspeed: fixed potential null pointer dereference

Before I skipped null checks when the master is in the STOP state; this
fixes that.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: f327c686d3ba ("i2c: aspeed: added driver for Aspeed I2C")

diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
index f19348328a715580aa37043abed6d1ee6b061cf4..6fdf9231c23cb0a4f4c736d95662495c2237e24f 100644 (file)
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -410,10 +410,11 @@ static bool aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus)
        }
 
        /* We are in an invalid state; reset bus to a known state. */
-       if (!bus->msgs && bus->master_state != ASPEED_I2C_MASTER_STOP) {
+       if (!bus->msgs) {
                dev_err(bus->dev, "bus in unknown state");
                bus->cmd_err = -EIO;
-               aspeed_i2c_do_stop(bus);
+               if (bus->master_state != ASPEED_I2C_MASTER_STOP)
+                       aspeed_i2c_do_stop(bus);
                goto out_no_complete;
        }
        msg = &bus->msgs[bus->msgs_index];