1USB_BLOCK_URB(9)                 USB Core APIs                USB_BLOCK_URB(9)
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NAME

6       usb_block_urb - reliably prevent further use of an URB
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SYNOPSIS

9       void usb_block_urb(struct urb * urb);
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ARGUMENTS

12       urb
13           pointer to URB to be blocked, may be NULL
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DESCRIPTION

16       After the routine has run, attempts to resubmit the URB will fail with
17       error -EPERM. Thus even if the URB's completion handler always tries to
18       resubmit, it will not succeed and the URB will become idle.
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20       The URB must not be deallocated while this routine is running. In
21       particular, when a driver calls this routine, it must insure that the
22       completion handler cannot deallocate the URB.
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25Kernel Hackers Manual 3.10         June 2019                  USB_BLOCK_URB(9)
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