From 2aa57f707fe9f187bd731475c1ec85147afc5bdb Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Tue, 18 Jun 2019 13:12:20 +0200 Subject: [PATCH] s390/qdio: don't touch the dsci in tiqdio_add_input_queues() 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: Signed-off-by: Julian Wiedmann Signed-off-by: Vasily Gorbik Signed-off-by: Greg Kroah-Hartman --- drivers/s390/cio/qdio_thinint.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c index 1139bbb..debe69a 100644 --- a/drivers/s390/cio/qdio_thinint.c +++ b/drivers/s390/cio/qdio_thinint.c @@ -80,7 +80,6 @@ void tiqdio_add_input_queues(struct qdio_irq *irq_ptr) 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) -- 2.7.4