diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2014-01-06 03:16:32 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-06 11:33:59 -0800 |
| commit | e8ca4934157c039fd1da479c5a7ad2684b1f1ab6 (patch) | |
| tree | 2f4d80d0d238d71ab4cd7f49e8c13b36aa5f68c5 | |
| parent | 0ff5f6294b1e1640251dccc8dd494fa3cd84522f (diff) | |
xhci: Avoid infinite loop when sg urb requires too many trbs
commit d6c9ea9069af684358efedcaf2f2f687f51c58ee upstream.
Currently prepare_ring() returns -ENOMEM if the urb won't fit into a
single ring segment. usb_sg_wait() treats this error as a temporary
condition and will keep retrying until something else goes wrong.
The number of retries should be limited in usb_sg_wait(), but also
prepare_ring() should not return an error code that suggests it might
be worth retrying. Change it to -EINVAL.
Reported-by: jidanni@jidanni.org
References: http://bugs.debian.org/733907
Fixes: 35773dac5f86 ('usb: xhci: Link TRB must not occur within a USB payload burst')
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 53c2e296467..64c36fe1ea6 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3008,7 +3008,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, if (num_trbs >= TRBS_PER_SEGMENT) { xhci_err(xhci, "Too many fragments %d, max %d\n", num_trbs, TRBS_PER_SEGMENT - 1); - return -ENOMEM; + return -EINVAL; } nop_cmd = cpu_to_le32(TRB_TYPE(TRB_TR_NOOP) | |