diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2015-01-29 11:29:13 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-03 09:29:58 -0700 |
| commit | 22029a0ccb163815f8ff3f0d41bb924565bed90b (patch) | |
| tree | 9b6e37623bfc373ec56eaecced41fc2645f45915 /fs | |
| parent | 637a3249626a7de6cfaa63e56930538f1e9829f9 (diff) | |
USB: usbfs: allow URBs to be reaped after disconnection
commit 3f2cee73b650921b2e214bf487b2061a1c266504 upstream.
The usbfs API has a peculiar hole: Users are not allowed to reap their
URBs after the device has been disconnected. There doesn't seem to be
any good reason for this; it is an ad-hoc inconsistency.
The patch allows users to issue the USBDEVFS_REAPURB and
USBDEVFS_REAPURBNDELAY ioctls (together with their 32-bit counterparts
on 64-bit systems) even after the device is gone. If no URBs are
pending for a disconnected device then the ioctls will return -ENODEV
rather than -EAGAIN, because obviously no new URBs will ever be able
to complete.
The patch also adds a new capability flag for
USBDEVFS_GET_CAPABILITIES to indicate that the reap-after-disconnect
feature is supported.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Chris Dickens <christopher.a.dickens@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions