[v2] s390/qdio: Ensure QDIO_IRQ_STATE_ACTIVE is set only after firmware activates.

[PATCH v2 0/1] s390/qdio: Ensure QDIO_IRQ_STATE_ACTIVE is set only after firmware activates.

Nihar Panda posted 1 patch 7 hours ago

Diff against v4
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arch/s390/include/asm/scsw.h |  4 +--
drivers/s390/cio/qdio_main.c | 59 +++++++++++++++++++++++++++---------
2 files changed, 47 insertions(+), 16 deletions(-)

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[PATCH v2 0/1] s390/qdio: Ensure QDIO_IRQ_STATE_ACTIVE is set only after firmware activates.

Posted by Nihar Panda 7 hours ago

Data Race Fix: 
Moved the execution of cio_update_schib() and qdio_set_state() 
under ccwdev_lock.
This prevents a data race on the shared sch->schib structure and ensures 
qdio_set_state() does not overwrite a STOPPED/ERR state when called 
locklessly (as identified by Sashiko AI).

Timeout Optimization: 
Converted the timeout polling loop from a while to a do..while loop. 
This fixes a preemption bug where a thread interruption could trigger 
a false ETIMEDOUT failure before the loop body could execute even once.

Nihar Panda (1):
  s390/qdio: Ensure QDIO_IRQ_STATE_ACTIVE is set only after firmware
    activates.

 arch/s390/include/asm/scsw.h |  4 +--
 drivers/s390/cio/qdio_main.c | 59 +++++++++++++++++++++++++++---------
 2 files changed, 47 insertions(+), 16 deletions(-)

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2.53.0