From: Nihar Panda <niharp@linux.ibm.com>
To: linux-s390@vger.kernel.org, vneethv@linux.ibm.com, oberpar@linux.ibm.com
Cc: linux-kernel@vger.kernel.org, gor@linux.ibm.com,
agordeev@linux.ibm.com, hca@linux.ibm.com, wintera@linux.ibm.com,
bblock@linux.ibm.com, nagamani@linux.ibm.com
Subject: [PATCH v2 0/1] s390/qdio: Ensure QDIO_IRQ_STATE_ACTIVE is set only after firmware activates.
Date: Thu, 24 Sep 2026 07:01:35 +0200 [thread overview]
Message-ID: <20260924050217.2583852-1-niharp@linux.ibm.com> (raw)
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(-)
--
2.53.0
next reply other threads:[~2026-09-24 5:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 5:01 Nihar Panda [this message]
2026-09-24 5:01 ` [PATCH v5 1/1] " Nihar Panda
2026-09-24 5:41 ` Heiko Carstens
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