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Message-ID: <20180409002239.163177-44-alexander.levin@microsoft.com> Date: Mon, 9 Apr 2018 00:23:24 +0000 From: Sasha Levin <Alexander.Levin@...rosoft.com> To: "stable@...r.kernel.org" <stable@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: Stefan Haberland <sth@...ux.vnet.ibm.com>, Martin Schwidefsky <schwidefsky@...ibm.com>, Sasha Levin <Alexander.Levin@...rosoft.com> Subject: [PATCH AUTOSEL for 4.9 044/293] s390/dasd: fix hanging safe offline From: Stefan Haberland <sth@...ux.vnet.ibm.com> [ Upstream commit e8ac01555d9e464249e8bb122337d6d6e5589ccc ] The safe offline processing may hang forever because it waits for I/O which can not be started because of the offline flag that prevents new I/O from being started. Allow I/O to be started during safe offline processing because in this special case we take care that the queues are empty before throwing away the device. Signed-off-by: Stefan Haberland <sth@...ux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com> --- drivers/s390/block/dasd.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 5ecd40884f01..0da246505f70 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1950,8 +1950,12 @@ static int __dasd_device_is_unusable(struct dasd_device *device, { int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM); - if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { - /* dasd is being set offline. */ + if (test_bit(DASD_FLAG_OFFLINE, &device->flags) && + !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + /* + * dasd is being set offline + * but it is no safe offline where we have to allow I/O + */ return 1; } if (device->stopped) { -- 2.15.1
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