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[media] smsusb: don't sleep while atomic
smscore_getbuffer() calls internally wait_event(), with can sleep. As smsusb_onresponse() is called on interrupt context, this causes the following warning: BUG: sleeping function called from invalid context at drivers/media/common/siano/smscoreapi.c:1653 in_atomic(): 1, irqs_disabled(): 1, pid: 11084, name: systemd-udevd INFO: lockdep is turned off. irq event stamp: 0 hardirqs last enabled at (0): [< (null)>] (null) hardirqs last disabled at (0): [<ffffffff811480f7>] copy_process.part.7+0x10e7/0x56d0 softirqs last enabled at (0): [<ffffffff81148193>] copy_process.part.7+0x1183/0x56d0 softirqs last disabled at (0): [< (null)>] (null) CPU: 2 PID: 11084 Comm: systemd-udevd Tainted: G B W 4.5.0-rc3+ #47 Hardware name: /NUC5i7RYB, BIOS RYBDWi35.86A.0350.2015.0812.1722 08/12/2015 0000000000000000 ffff8803c6907a80 ffffffff81933901 ffff8802bd916000 ffff8802bd9165c8 ffff8803c6907aa8 ffffffff811c6af5 ffff8802bd916000 ffffffffa0ce9b60 0000000000000675 ffff8803c6907ae8 ffffffff811c6ce5 Call Trace: <IRQ> [<ffffffff81933901>] dump_stack+0x85/0xc4 [<ffffffff811c6af5>] ___might_sleep+0x245/0x3a0 [<ffffffff811c6ce5>] __might_sleep+0x95/0x1a0 [<ffffffffa0ce020a>] ? list_add_locked+0xca/0x140 [smsmdtv] [<ffffffffa0ce3b8d>] smscore_getbuffer+0x7d/0x120 [smsmdtv] [<ffffffff8123819d>] ? trace_hardirqs_off+0xd/0x10 [<ffffffffa0ce3b10>] ? smscore_sendrequest_and_wait.isra.5+0x120/0x120 [smsmdtv] [<ffffffffa0ce020a>] ? list_add_locked+0xca/0x140 [smsmdtv] [<ffffffffa0ce13ca>] ? smscore_putbuffer+0x3a/0x40 [smsmdtv] [<ffffffffa0d107bc>] smsusb_submit_urb+0x2ec/0x4f0 [smsusb] [<ffffffffa0d10e36>] smsusb_onresponse+0x476/0x720 [smsusb] Let's add a work queue to handle the bottom half, preventing this problem. Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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