diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2009-09-01 11:09:56 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-23 06:46:39 -0700 |
| commit | 01c6460f968d7b57fc6f98adb587952628c6e099 (patch) | |
| tree | 7eb51548d2db9ced665af1a5def7748cad983e34 /include/linux/usbdevice_fs.h | |
| parent | e6929a9020acbeb04d9a3ad9a88234c15be808fd (diff) | |
USB: usbfs: add USBDEVFS_URB_BULK_CONTINUATION flag
This patch (as1283) adds a new flag, USBDEVFS_URB_BULK_CONTINUATION,
to usbfs. It is intended for userspace libraries such as libusb and
openusb. When they have to break up a single usbfs bulk transfer into
multiple URBs, they will set the flag on all but the first URB of the
series.
If an error other than an unlink occurs, the kernel will automatically
cancel all the following URBs for the same endpoint and refuse to
accept new submissions, until an URB is encountered that is not marked
as a BULK_CONTINUATION. Such an URB would indicate the start of a new
transfer or the presence of an older library, so the kernel returns to
normal operation.
This enables libraries to delimit bulk transfers correctly, even in
the presence of early termination as indicated by short packets.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usbdevice_fs.h')
| -rw-r--r-- | include/linux/usbdevice_fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/usbdevice_fs.h b/include/linux/usbdevice_fs.h index 00ceebeb9e5..b2a7d8ba6ee 100644 --- a/include/linux/usbdevice_fs.h +++ b/include/linux/usbdevice_fs.h @@ -77,6 +77,7 @@ struct usbdevfs_connectinfo { #define USBDEVFS_URB_SHORT_NOT_OK 0x01 #define USBDEVFS_URB_ISO_ASAP 0x02 +#define USBDEVFS_URB_BULK_CONTINUATION 0x04 #define USBDEVFS_URB_NO_FSBR 0x20 #define USBDEVFS_URB_ZERO_PACKET 0x40 #define USBDEVFS_URB_NO_INTERRUPT 0x80 |