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| author | Alan Stern <stern@rowland.harvard.edu> | 2010-07-14 17:03:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 23:35:40 +0200 |
| commit | ffda080353979273e8aa69fc1e6134f20643ae56 (patch) | |
| tree | 3d4981380afc2123e906a85948c20a299c4a52bf /drivers/usb/host/ehci-hcd.c | |
| parent | USB: EHCI: simplify remainder computations (diff) | |
| download | linux-ffda080353979273e8aa69fc1e6134f20643ae56.tar.xz linux-ffda080353979273e8aa69fc1e6134f20643ae56.zip | |
USB: EHCI: add missing frame -> microframe conversion
This patch (as1407) fixes a bug in ehci-hcd's isochronous scheduler.
All its calculations should be done in terms of microframes, but for
full-speed devices, sched->span is stored in frames. It needs to be
converted.
This fix is liable to expose problems in other drivers. The old code
would accept URBs that should not have been accepted, so drivers have
had no reason to avoid submitting URBs that exceeded the maximum
schedule length. In an attempt to partially compensate for this, the
patch also adjusts the schedule length from a minimum of 256 frames up
to a minimum of 512 frames.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 2e704fa3cedf..34a928d3b7d2 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -79,7 +79,13 @@ static const char hcd_name [] = "ehci_hcd"; #define EHCI_TUNE_RL_TT 0 #define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */ #define EHCI_TUNE_MULT_TT 1 -#define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */ +/* + * Some drivers think it's safe to schedule isochronous transfers more than + * 256 ms into the future (partly as a result of an old bug in the scheduling + * code). In an attempt to avoid trouble, we will use a minimum scheduling + * length of 512 frames instead of 256. + */ +#define EHCI_TUNE_FLS 1 /* (medium) 512-frame schedule */ #define EHCI_IAA_MSECS 10 /* arbitrary */ #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */ |