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31a14400e8
Currently blkfront gives a warning when hot unplugging due to calling del_gendisk() with interrupts disabled (due to blkif_io_lock). WARNING: at kernel/softirq.c:124 local_bh_enable+0x36/0x84() Modules linked in: xenfs xen_netfront ext3 jbd mbcache xen_blkfront Pid: 13, comm: xenwatch Not tainted 2.6.29-xs5.5.0.13 #3 Call Trace: [<c012611c>] warn_slowpath+0x80/0xb6 [<c0104cf1>] xen_sched_clock+0x16/0x63 [<c0104710>] xen_force_evtchn_callback+0xc/0x10 [<c0104e32>] check_events+0x8/0xe [<c0104d9b>] xen_restore_fl_direct_end+0x0/0x1 [<c0103749>] xen_mc_flush+0x10a/0x13f [<c0105bd2>] __switch_to+0x114/0x14e [<c011d92b>] dequeue_task+0x62/0x70 [<c0123b6f>] finish_task_switch+0x2b/0x84 [<c0299877>] schedule+0x66d/0x6e7 [<c0104710>] xen_force_evtchn_callback+0xc/0x10 [<c0104710>] xen_force_evtchn_callback+0xc/0x10 [<c012a642>] local_bh_enable+0x36/0x84 [<c022f9a7>] sk_filter+0x57/0x5c [<c0233dae>] netlink_broadcast+0x1d5/0x315 [<c01c6371>] kobject_uevent_env+0x28d/0x331 [<c01e7ead>] device_del+0x10f/0x120 [<c01e7ec6>] device_unregister+0x8/0x10 [<c015f86d>] bdi_unregister+0x2d/0x39 [<c01bf6f4>] unlink_gendisk+0x23/0x3e [<c01ac946>] del_gendisk+0x7b/0xe7 [<d0828c19>] blkfront_closing+0x28/0x6e [xen_blkfront] [<d082900c>] backend_changed+0x3ad/0x41d [xen_blkfront] We can fix this by calling del_gendisk() later in blkfront_closing, after releasing blkif_io_lock. Since the queue is stopped during the interrupts disabled phase I don't think there is any danger of an event occuring between releasing the blkif_io_lock and deleting the disk. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com> |
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| .. | ||
| aoe | ||
| paride | ||
| amiflop.c | ||
| ataflop.c | ||
| brd.c | ||
| cciss.c | ||
| cciss.h | ||
| cciss_cmd.h | ||
| cciss_scsi.c | ||
| cciss_scsi.h | ||
| cpqarray.c | ||
| cpqarray.h | ||
| cryptoloop.c | ||
| DAC960.c | ||
| DAC960.h | ||
| floppy.c | ||
| hd.c | ||
| ida_cmd.h | ||
| ida_ioctl.h | ||
| Kconfig | ||
| loop.c | ||
| Makefile | ||
| mg_disk.c | ||
| nbd.c | ||
| pktcdvd.c | ||
| ps3disk.c | ||
| ps3vram.c | ||
| smart1,2.h | ||
| sunvdc.c | ||
| swim.c | ||
| swim3.c | ||
| swim_asm.S | ||
| sx8.c | ||
| ub.c | ||
| umem.c | ||
| umem.h | ||
| viodasd.c | ||
| virtio_blk.c | ||
| xd.c | ||
| xd.h | ||
| xen-blkfront.c | ||
| xsysace.c | ||
| z2ram.c | ||