Commit 408358b5 authored Nov 07, 2017 by Jason J. Herne Committed by Cornelia Huck Nov 08, 2017

s390: vfio-ccw: Do not attempt to free no-op, test and tic cda.



Because we do not make use of the cda (channel data address) for test,
no-op ccws no address translation takes place. This means cda could
contain a guest address which we do not want to attempt to free. Let's
check the command type and skip cda free when it is not needed.

For a TIC ccw, ccw->cda points to either a ccw in an existing chain or
it points to a whole new allocated chain. In either case the data will
be freed when the owning chain is freed.

Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Message-Id: <1510068152-21988-1-git-send-email-jjherne@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

parent 978fa72e

drivers/s390/cio/vfio_ccw_cp.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -332,6 +332,8 @@ static void ccwchain_cda_free(struct ccwchain *chain, int idx)
		{
		struct ccw1 *ccw = chain->ch_ccw + idx;

		if (ccw_is_test(ccw) \|\| ccw_is_noop(ccw) \|\| ccw_is_tic(ccw))
		return;
		if (!ccw->count)
		return;

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