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| author | Alan Stern <stern@rowland.harvard.edu> | 2013-01-31 01:36:40 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-31 13:14:48 +0400 |
| commit | 3e619d04159be54b3daa0b7036b0ce9e067f4b5d (patch) | |
| tree | acc77a30daea819c03bcb9edabedf30a38a661d0 /scripts/mksysmap | |
| parent | b09a61cc0bc2a7151f4ab652489e85253d5d0175 (diff) | |
| download | linux-3e619d04159be54b3daa0b7036b0ce9e067f4b5d.tar.xz | |
USB: EHCI: fix bug in scheduling periodic split transfers
This patch (as1654) fixes a very old bug in ehci-hcd, connected with
scheduling of periodic split transfers. The calculations for
full/low-speed bus usage are all carried out after the correction for
bit-stuffing has been applied, but the values in the max_tt_usecs
array assume it hasn't been. The array should allow for allocation of
up to 90% of the bus capacity, which is 900 us, not 780 us.
The symptom caused by this bug is that any isochronous transfer to a
full-speed device with a maxpacket size larger than about 980 bytes is
always rejected with a -ENOSPC error.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts/mksysmap')
0 files changed, 0 insertions, 0 deletions