From 0c2bd9b24e73287aa4ee87844c847205e0da8a9b Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Thu, 3 Mar 2011 17:56:07 +0100 Subject: [S390] tape: deadlock on system work queue The 34xx and 3590 tape driver uses the system work queue to defer work from the interrupt function to process context, e.g. a medium sense after an unsolicited interrupt. The tape commands started by the work handler need to be asynchronous, otherwise a deadlock on the system work queue can occur. Signed-off-by: Martin Schwidefsky --- drivers/s390/char/tape.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/s390/char/tape.h') diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h index 7a242f073632..267b54e8ff5a 100644 --- a/drivers/s390/char/tape.h +++ b/drivers/s390/char/tape.h @@ -280,6 +280,14 @@ tape_do_io_free(struct tape_device *device, struct tape_request *request) return rc; } +static inline void +tape_do_io_async_free(struct tape_device *device, struct tape_request *request) +{ + request->callback = (void *) tape_free_request; + request->callback_data = NULL; + tape_do_io_async(device, request); +} + extern int tape_oper_handler(int irq, int status); extern void tape_noper_handler(int irq, int status); extern int tape_open(struct tape_device *); -- cgit v1.2.3