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drm/dp/mst: take lock around looking up the branch device on hpd irq

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If we are doing an MST transaction and we've gotten HPD and we
lookup the device from the incoming msg, we should take the mgr
lock around it, so that mst_primary and mstb->ports are valid.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2015-06-22 14:40:44 +10:00
parent 9254ec496a
commit 9eb1e57f56
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/drm_dp_mst_topology.c
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@ -1163,6 +1163,8 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_
struct drm_dp_mst_port *port; struct drm_dp_mst_port *port;
int i; int i;
/* find the port by iterating down */ /* find the port by iterating down */
mutex_lock(&mgr->lock);
mstb = mgr->mst_primary; mstb = mgr->mst_primary;
for (i = 0; i < lct - 1; i++) { for (i = 0; i < lct - 1; i++) {
@ -1182,6 +1184,7 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_
} }
} }
kref_get(&mstb->kref); kref_get(&mstb->kref);
mutex_unlock(&mgr->lock);
return mstb; return mstb;
} }