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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-26 01:47:04 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-26 01:47:04 +0100 |
| commit | 7c8d891c2c7714965db1685289787b0c526f9c42 (patch) | |
| tree | 63f4bb25df1a3b9798d318e8c2c28b959709f182 /drivers/s390/cio/qdio_main.c | |
| parent | Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus (diff) | |
| parent | [S390] cmpxchg: implement cmpxchg64() (diff) | |
| download | linux-7c8d891c2c7714965db1685289787b0c526f9c42.tar.xz linux-7c8d891c2c7714965db1685289787b0c526f9c42.zip | |
Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
[S390] cmpxchg: implement cmpxchg64()
[S390] xchg/cmpxchg: move to own header file
[S390] ccwgroup_driver: remove duplicate members
[S390] ccw_bus_type: make it static
[S390] ccw_driver: remove duplicate members
[S390] qdio: prevent handling of buffers if count is zero
[S390] setup: register bss section as resource
[S390] setup: simplify setup_resources()
[S390] wire up sys_syncfs
[S390] wire up sys_clock_adjtime
[S390] wire up sys_open_by_handle_at
[S390] wire up sys_name_to_handle_at
[S390] oprofile: disable hw sampling for CONFIG_32BIT
[S390] early: limit savesys cmd string handling
[S390] early: Fix possible overlapping data buffer
Diffstat (limited to 'drivers/s390/cio/qdio_main.c')
| -rw-r--r-- | drivers/s390/cio/qdio_main.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 5640c89cd9de..479c665e9e7c 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -1508,7 +1508,8 @@ int do_QDIO(struct ccw_device *cdev, unsigned int callflags, if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) return -EBUSY; - + if (!count) + return 0; if (callflags & QDIO_FLAG_SYNC_INPUT) return handle_inbound(irq_ptr->input_qs[q_nr], callflags, bufnr, count); |