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This patch (as1521b) fixes the interaction between usb-storage's scanning thread and the freezer. The current implementation has a race: If the device is unplugged shortly after being plugged in and just as a system sleep begins, the scanning thread may get frozen before the khubd task. Khubd won't be able to freeze until the disconnect processing is complete, and the disconnect processing can't proceed until the scanning thread finishes, so the sleep transition will fail. The implementation in the 3.2 kernel suffers from an additional problem. There the scanning thread calls set_freezable_with_signal(), and the signals sent by the freezer will mess up the thread's I/O delays, which are all interruptible. The solution to both problems is the same: Replace the kernel thread used for scanning with a delayed-work routine on the system freezable work queue. Freezable work queues have the nice property that you can cancel a work item even while the work queue is frozen, and no signals are needed. The 3.2 version of this patch solves the problem in Bugzilla #42730. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Seth Forshee <seth.forshee@canonical.com> CC: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| alauda.c | ||
| cypress_atacb.c | ||
| datafab.c | ||
| debug.c | ||
| debug.h | ||
| ene_ub6250.c | ||
| freecom.c | ||
| initializers.c | ||
| initializers.h | ||
| isd200.c | ||
| jumpshot.c | ||
| karma.c | ||
| Kconfig | ||
| libusual.c | ||
| Makefile | ||
| onetouch.c | ||
| option_ms.c | ||
| option_ms.h | ||
| protocol.c | ||
| protocol.h | ||
| realtek_cr.c | ||
| scsiglue.c | ||
| scsiglue.h | ||
| sddr09.c | ||
| sddr55.c | ||
| shuttle_usbat.c | ||
| sierra_ms.c | ||
| sierra_ms.h | ||
| transport.c | ||
| transport.h | ||
| uas.c | ||
| unusual_alauda.h | ||
| unusual_cypress.h | ||
| unusual_datafab.h | ||
| unusual_devs.h | ||
| unusual_ene_ub6250.h | ||
| unusual_freecom.h | ||
| unusual_isd200.h | ||
| unusual_jumpshot.h | ||
| unusual_karma.h | ||
| unusual_onetouch.h | ||
| unusual_realtek.h | ||
| unusual_sddr09.h | ||
| unusual_sddr55.h | ||
| unusual_usbat.h | ||
| usb.c | ||
| usb.h | ||
| usual-tables.c | ||