diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2013-10-11 11:28:52 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-11 16:40:26 -0700 |
| commit | 91a99b5e78849db90dc2f5e8dfa034af43bdb760 (patch) | |
| tree | 27af7c91347333591d6e47e043072400ea55f74b | |
| parent | 27c4a31d6739095d613c6e72fb44867bc28c699f (diff) | |
| download | linux-91a99b5e78849db90dc2f5e8dfa034af43bdb760.tar.bz2 | |
USB: EHCI: use consistent NO_FRAME value
ehci-hcd is inconsistent in the sentinel values it uses to indicate
that no frame number has been assigned for a periodic transfer. Some
places it uses NO_FRAME (defined as 65535), other places it uses -1,
and elsewhere it uses 9999.
This patch defines a value for NO_FRAME which can fit in a 16-bit
signed integer, and changes the code to use it everywhere.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/host/ehci-sched.c | 8 | ||||
| -rw-r--r-- | drivers/usb/host/ehci.h | 5 |
2 files changed, 7 insertions, 6 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index 1fc2befc4fdc..37e97a70894a 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -813,7 +813,7 @@ static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh) frame = qh->start; /* reuse the previous schedule slots, if we can */ - if (frame < qh->period) { + if (frame != NO_FRAME) { uframe = ffs(hc32_to_cpup(ehci, &hw->hw_info2) & QH_SMASK); status = check_intr_schedule (ehci, frame, --uframe, qh, &c_mask); @@ -969,7 +969,7 @@ iso_stream_alloc (gfp_t mem_flags) if (likely (stream != NULL)) { INIT_LIST_HEAD(&stream->td_list); INIT_LIST_HEAD(&stream->free_list); - stream->next_uframe = -1; + stream->next_uframe = NO_FRAME; } return stream; } @@ -1236,7 +1236,7 @@ itd_urb_transaction ( memset (itd, 0, sizeof *itd); itd->itd_dma = itd_dma; - itd->frame = 9999; /* an invalid value */ + itd->frame = NO_FRAME; list_add (&itd->itd_list, &sched->td_list); } spin_unlock_irqrestore (&ehci->lock, flags); @@ -1967,7 +1967,7 @@ sitd_urb_transaction ( memset (sitd, 0, sizeof *sitd); sitd->sitd_dma = sitd_dma; - sitd->frame = 9999; /* an invalid value */ + sitd->frame = NO_FRAME; list_add (&sitd->sitd_list, &iso_sched->td_list); } diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 2d401927e143..b93eb59bb529 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -54,6 +54,8 @@ struct ehci_stats { unsigned long unlink; }; +#define NO_FRAME 29999 /* frame not assigned yet */ + /* ehci_hcd->lock guards shared data against other CPUs: * ehci_hcd: async, unlink, periodic (and shadow), ... * usb_host_endpoint: hcpriv @@ -405,7 +407,6 @@ struct ehci_qh { u16 tt_usecs; /* tt downstream bandwidth */ unsigned short period; /* polling interval */ unsigned short start; /* where polling starts */ -#define NO_FRAME ((unsigned short)~0) /* pick new start */ struct usb_device *dev; /* access to TT */ unsigned is_out:1; /* bulk or intr OUT */ @@ -454,7 +455,7 @@ struct ehci_iso_stream { struct usb_host_endpoint *ep; /* output of (re)scheduling */ - int next_uframe; + unsigned next_uframe; __hc32 splits; /* the rest is derived from the endpoint descriptor, |