diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-12-04 14:01:02 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-12-04 14:01:02 +0100 |
| commit | c09c9dd2e9c732658c744a802101d5c34fedde22 (patch) | |
| tree | 89f930ede811e66e7a70761aaca079d779fed38a /drivers/gpu/drm/drm_dp_mst_topology.c | |
| parent | 727ae8be30b428082d3519817f4fb98b712d457d (diff) | |
| parent | 06bf403de344a8a0811ebd24992d2a08022c5225 (diff) | |
Merge branches 'acpi-pci' and 'pm-pci'
* acpi-pci:
x86/PCI/ACPI: Fix regression caused by commit 4d6b4e69a245
* pm-pci:
PCI / PM: Tune down retryable runtime suspend error messages
Diffstat (limited to 'drivers/gpu/drm/drm_dp_mst_topology.c')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index bf27a07dbce3..809959d56d78 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1194,17 +1194,18 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_ list_for_each_entry(port, &mstb->ports, next) { if (port->port_num == port_num) { - if (!port->mstb) { + mstb = port->mstb; + if (!mstb) { DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); - return NULL; + goto out; } - mstb = port->mstb; break; } } } kref_get(&mstb->kref); +out: mutex_unlock(&mgr->lock); return mstb; } @@ -2801,12 +2802,13 @@ static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs if (msgs[num - 1].flags & I2C_M_RD) reading = true; - if (!reading) { + if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); ret = -EIO; goto out; } + memset(&msg, 0, sizeof(msg)); msg.req_type = DP_REMOTE_I2C_READ; msg.u.i2c_read.num_transactions = num - 1; msg.u.i2c_read.port_number = port->port_num; |