tree 42a62d5218a6edb26efa8a21eabfe5973dcb03ae
parent 1b0d76cb9d5a65567230097a2512046f09f30523
author H Hartley Sweeten <hsweeten@visionengravers.com> 1269227360 +0800
committer Eric Miao <eric.y.miao@gmail.com> 1269230589 +0800

[ARM] locomo: fix unpaired spin_lock_irqsave

The function locomo_m62332_senddata sends a three byte i2c message to
a M62332 DAC. This entire function is guarded with a spin_lock_irqsave
at the start of the function and a spin_unlock_irqrestore at the end.

As each byte is transferred, the i2c ACK from the DAC is checked.
Currently, if the ACK is missing the function simply returns without
the unlock. It also leaves the i2c bus in an invalid state since the
last byte transferred did not have a "stop" condition and leave the
bus idle.

Fix this by adding an exit path using goto.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>