From: Julian Wiedmann jwi@linux.ibm.com
commit ac6639cd3db607d386616487902b4cc1850a7be5 upstream.
Current code sets the dsci to 0x00000080. Which doesn't make any sense, as the indicator area is located in the _left-most_ byte.
Worse: if the dsci is the _shared_ indicator, this potentially clears the indication of activity for a _different_ device. tiqdio_thinint_handler() will then have no reason to call that device's IRQ handler, and the device ends up stalling.
Fixes: d0c9d4a89fff ("[S390] qdio: set correct bit in dsci") Cc: stable@vger.kernel.org Signed-off-by: Julian Wiedmann jwi@linux.ibm.com Signed-off-by: Vasily Gorbik gor@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/s390/cio/qdio_thinint.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/s390/cio/qdio_thinint.c +++ b/drivers/s390/cio/qdio_thinint.c @@ -79,7 +79,6 @@ void tiqdio_add_input_queues(struct qdio mutex_lock(&tiq_list_lock); list_add_rcu(&irq_ptr->input_qs[0]->entry, &tiq_list); mutex_unlock(&tiq_list_lock); - xchg(irq_ptr->dsci, 1 << 7); }
void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)