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usb-storage: use first bulk endpoints, not last

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According to the Bulk-Only spec, usb-storage is supposed to use the
_first_ bulk-in and bulk-out endpoints it finds, not the _last_.  And
while we're at it, we ought to test the direction of the interrupt
endpoint as well.  This patch (as842) makes both changes.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-01-22 11:58:34 -05:00 committed by Greg Kroah-Hartman
parent 629e4427aa
commit 1096f780d0
1 changed files with 12 additions and 11 deletions
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23
drivers/usb/storage/usb.c
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@ -731,26 +731,27 @@ static int get_pipes(struct us_data *us)
struct usb_endpoint_descriptor *ep_int = NULL;
/*
* Find the endpoints we need.
* Find the first endpoint of each type we need.
* We are expecting a minimum of 2 endpoints - in and out (bulk).
* An optional interrupt is OK (necessary for CBI protocol).
* An optional interrupt-in is OK (necessary for CBI protocol).
* We will ignore any others.
*/
for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
ep = &altsetting->endpoint[i].desc;
/* Is it a BULK endpoint? */
if (usb_endpoint_xfer_bulk(ep)) {
/* BULK in or out? */
if (usb_endpoint_dir_in(ep))
ep_in = ep;
else
ep_out = ep;
if (usb_endpoint_dir_in(ep)) {
if (!ep_in)
ep_in = ep;
} else {
if (!ep_out)
ep_out = ep;
}
}
/* Is it an interrupt endpoint? */
else if (usb_endpoint_xfer_int(ep)) {
ep_int = ep;
else if (usb_endpoint_is_int_in(ep)) {
if (!ep_int)
ep_int = ep;
}
}