[PATCH 4.9 24/28] s390/qeth: lock read device while queueing next buffer

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Julian Wiedmann [ Upstream commit 17bf8c9b3d499d5168537c98b61eb7a1fcbca6c2 ] For calling ccw_device_start(), issue_next_read() needs to hold the device's ccwlock.

[PATCH 4.9 24/28] s390/qeth: lock read device while queueing next buffer

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Julian Wiedmann [ Upstream commit 17bf8c9b3d499d5168537c98b61eb7a1fcbca6c2 ] For calling ccw_device_start(), issue_next_read() needs to hold the device's ccwlock. This is satisfied for the