3.16.51-rc1 review patch. If anyone has any objections, please let me know.
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From: Bart Van Assche bart.vanassche@wdc.com
commit 4ddd56b003f251091a67c15ae3fe4a5c5c5e390a upstream.
Calling blk_start_queue() from interrupt context with the queue lock held and without disabling IRQs, as the skd driver does, is safe. This patch avoids that loading the skd driver triggers the following warning:
WARNING: CPU: 11 PID: 1348 at block/blk-core.c:283 blk_start_queue+0x84/0xa0 RIP: 0010:blk_start_queue+0x84/0xa0 Call Trace: skd_unquiesce_dev+0x12a/0x1d0 [skd] skd_complete_internal+0x1e7/0x5a0 [skd] skd_complete_other+0xc2/0xd0 [skd] skd_isr_completion_posted.isra.30+0x2a5/0x470 [skd] skd_isr+0x14f/0x180 [skd] irq_forced_thread_fn+0x2a/0x70 irq_thread+0x144/0x1a0 kthread+0x125/0x140 ret_from_fork+0x2a/0x40
Fixes: commit a038e2536472 ("[PATCH] blk_start_queue() must be called with irq disabled - add warning") Signed-off-by: Bart Van Assche bart.vanassche@wdc.com Cc: Paolo 'Blaisorblade' Giarrusso blaisorblade@yahoo.it Cc: Andrew Morton akpm@osdl.org Cc: Christoph Hellwig hch@lst.de Cc: Hannes Reinecke hare@suse.de Cc: Johannes Thumshirn jthumshirn@suse.de Signed-off-by: Jens Axboe axboe@kernel.dk [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- block/blk-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/block/blk-core.c +++ b/block/blk-core.c @@ -198,7 +198,7 @@ EXPORT_SYMBOL(blk_delay_queue); **/ void blk_start_queue(struct request_queue *q) { - WARN_ON(!irqs_disabled()); + WARN_ON(!in_interrupt() && !irqs_disabled());
queue_flag_clear(QUEUE_FLAG_STOPPED, q); __blk_run_queue(q);