commit c91b1869fb6f6d58f6321b8a88bd39577b0413a7
author Malcolm Priestley <tvboxspy@gmail.com> Thu May 15 22:49:19 2014 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Thu May 15 15:02:19 2014 -0700
tree a5c80b338d395531c8942537d2f26c59d50379ac
parent 97641ca2b284ddc9870afdcfe22487702ee27b3e

staging: vt6656: lock changes: usbpipe.c add mutex lock.

PIPEnsControlOut and PIPEnsControlIn are nolonger
atomic but they do need a usb lock.

Add new mutex lock for these functions and PIPEnsControlOutAsyn.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/usbpipe.c

diff --git a/drivers/staging/vt6656/usbpipe.c b/drivers/staging/vt6656/usbpipe.c
index 836da00..934d0a9 100644
--- a/drivers/staging/vt6656/usbpipe.c
+++ b/drivers/staging/vt6656/usbpipe.c
@@ -82,6 +82,8 @@
         return STATUS_FAILURE;
     }
 
+	mutex_lock(&pDevice->usb_lock);
+
     ntStatus = usb_control_msg(
                             pDevice->usb,
                             usb_sndctrlpipe(pDevice->usb , 0),
@@ -100,6 +102,8 @@
         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"usb_sndctrlpipe fail, ntStatus= %d\n", ntStatus);
     }
 
+	mutex_unlock(&pDevice->usb_lock);
+
     return ntStatus;
 }
 
@@ -123,6 +127,8 @@
 	if (pDevice->pControlURB->hcpriv)
 		return STATUS_FAILURE;
 
+	mutex_lock(&pDevice->usb_lock);
+
 	MP_SET_FLAG(pDevice, fMP_CONTROL_WRITES);
 
 	pDevice->sUsbCtlRequest.bRequestType = 0x40;
@@ -143,6 +149,7 @@
 			"control send request submission failed: %d\n",
 				ntStatus);
 		MP_CLEAR_FLAG(pDevice, fMP_CONTROL_WRITES);
+		mutex_unlock(&pDevice->usb_lock);
 		return STATUS_FAILURE;
 	}
 
@@ -157,10 +164,13 @@
 		DBG_PRT(MSG_LEVEL_DEBUG,
 			KERN_INFO "control send request submission timeout\n");
             MP_CLEAR_FLAG(pDevice, fMP_CONTROL_WRITES);
+	    mutex_unlock(&pDevice->usb_lock);
             return STATUS_FAILURE;
         }
     }
 
+	mutex_unlock(&pDevice->usb_lock);
+
     return STATUS_SUCCESS;
 }
 
@@ -184,6 +194,8 @@
 	if (pDevice->pControlURB->hcpriv)
 		return STATUS_FAILURE;
 
+	mutex_lock(&pDevice->usb_lock);
+
 	MP_SET_FLAG(pDevice, fMP_CONTROL_READS);
 
 	pDevice->sUsbCtlRequest.bRequestType = 0xC0;
@@ -202,6 +214,7 @@
 		DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO
 			"control request submission failed: %d\n", ntStatus);
 		MP_CLEAR_FLAG(pDevice, fMP_CONTROL_READS);
+		mutex_unlock(&pDevice->usb_lock);
 		return STATUS_FAILURE;
 	}
 
@@ -216,10 +229,13 @@
 		DBG_PRT(MSG_LEVEL_DEBUG,
 			KERN_INFO "control rcv request submission timeout\n");
             MP_CLEAR_FLAG(pDevice, fMP_CONTROL_READS);
+	    mutex_unlock(&pDevice->usb_lock);
             return STATUS_FAILURE;
         }
     }
 
+	mutex_unlock(&pDevice->usb_lock);
+
     return ntStatus;
 }