openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

staging: vt6656: Fix URB submitted while active warning. 

This error happens because PIPEnsControlOut and PIPEnsControlIn unlock the
spin lock for delay, letting in another thread.

The patch moves the current MP_SET_FLAG to before filling
of sUsbCtlRequest for pControlURB and clears it in event of failing.

Any thread calling either function while fMP_CONTROL_READS or fMP_CONTROL_WRITES
flags set will return STATUS_FAILURE.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: stable@vger.kernel.org # 3.8
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Malcolm Priestley 2013-01-30 20:07:29 +00:00 committed by Greg Kroah-Hartman
parent d13b0b6d51
commit ae5943de8c
1 changed files with 20 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/staging/vt6656/usbpipe.c
View File

@ -126,6 +126,11 @@ int PIPEnsControlOut(struct vnt_private *pDevice, u8 byRequest, u16 wValue,
if (pDevice->Flags & fMP_CONTROL_WRITES)
return STATUS_FAILURE;
if (pDevice->Flags & fMP_CONTROL_READS)
return STATUS_FAILURE;
MP_SET_FLAG(pDevice, fMP_CONTROL_WRITES);
pDevice->sUsbCtlRequest.bRequestType = 0x40;
pDevice->sUsbCtlRequest.bRequest = byRequest;
pDevice->sUsbCtlRequest.wValue = cpu_to_le16p(&wValue);
@ -140,12 +145,13 @@ int PIPEnsControlOut(struct vnt_private *pDevice, u8 byRequest, u16 wValue,
ntStatus = usb_submit_urb(pDevice->pControlURB, GFP_ATOMIC);
if (ntStatus != 0) {
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"control send request submission failed: %d\n", ntStatus);
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO
"control send request submission failed: %d\n",
ntStatus);
MP_CLEAR_FLAG(pDevice, fMP_CONTROL_WRITES);
return STATUS_FAILURE;
}
else {
MP_SET_FLAG(pDevice, fMP_CONTROL_WRITES);
}
spin_unlock_irq(&pDevice->lock);
for (ii = 0; ii <= USB_CTL_WAIT; ii ++) {
@ -179,6 +185,11 @@ int PIPEnsControlIn(struct vnt_private *pDevice, u8 byRequest, u16 wValue,
if (pDevice->Flags & fMP_CONTROL_READS)
return STATUS_FAILURE;
if (pDevice->Flags & fMP_CONTROL_WRITES)
return STATUS_FAILURE;
MP_SET_FLAG(pDevice, fMP_CONTROL_READS);
pDevice->sUsbCtlRequest.bRequestType = 0xC0;
pDevice->sUsbCtlRequest.bRequest = byRequest;
pDevice->sUsbCtlRequest.wValue = cpu_to_le16p(&wValue);
@ -192,9 +203,10 @@ int PIPEnsControlIn(struct vnt_private *pDevice, u8 byRequest, u16 wValue,
ntStatus = usb_submit_urb(pDevice->pControlURB, GFP_ATOMIC);
if (ntStatus != 0) {
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"control request submission failed: %d\n", ntStatus);
}else {
MP_SET_FLAG(pDevice, fMP_CONTROL_READS);
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO
"control request submission failed: %d\n", ntStatus);
MP_CLEAR_FLAG(pDevice, fMP_CONTROL_READS);
return STATUS_FAILURE;
}
spin_unlock_irq(&pDevice->lock);