linux-kernel - [PATCH 5.11 011/342] s390/cio: remove invalid condition on IO_SCH

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Date:   Mon, 10 May 2021 12:16:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian Ehrhardt <christian.ehrhardt@...onical.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: [PATCH 5.11 011/342] s390/cio: remove invalid condition on IO_SCH_UNREG

From: Vineeth Vijayan <vneethv@...ux.ibm.com>

commit 2f7484fd73729f89085fe08d683f5a8d9e17fe99 upstream.

The condition to check the cdev pointer validity on
css_sch_device_unregister() is a leftover from the 'commit 8cc0dcfdc1c0
("s390/cio: remove pm support from ccw bus driver")'. This could lead to a
situation, where detaching the device is not happening completely. Remove
this invalid condition in the IO_SCH_UNREG case.

Link: https://lore.kernel.org/r/20210423100843.2230969-1-vneethv@linux.ibm.com
Fixes: 8cc0dcfdc1c0 ("s390/cio: remove pm support from ccw bus driver")
Reported-by: Christian Ehrhardt <christian.ehrhardt@...onical.com>
Suggested-by: Christian Ehrhardt <christian.ehrhardt@...onical.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Vineeth Vijayan <vneethv@...ux.ibm.com>
Tested-by: Julian Wiedmann <jwi@...ux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
Tested-by: Christian Ehrhardt <christian.ehrhardt@...onical.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/s390/cio/device.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1525,8 +1525,7 @@ static int io_subchannel_sch_event(struc
 	switch (action) {
 	case IO_SCH_ORPH_UNREG:
 	case IO_SCH_UNREG:
-		if (!cdev)
-			css_sch_device_unregister(sch);
+		css_sch_device_unregister(sch);
 		break;
 	case IO_SCH_ORPH_ATTACH:
 	case IO_SCH_UNREG_ATTACH: