“932ae8809469770a07ce19d6967d2ce303befa08”上不存在“README.md”
  1. 18 9月, 2013 3 次提交
    • A
      USB: EHCI: handle isochronous underruns with tasklets · 46c73d1d
      Alan Stern 提交于
      This patch updates the iso_stream_schedule() routine in ehci-sched.c
      to handle cases where an underrun causes an isochronous endpoint's
      queue to empty out, but the client driver wants to maintain
      synchronization with the device (i.e., the URB_ISO_ASAP flag is not
      set).  This could not happen until recently, when ehci-hcd switched
      over to completing URBs in a tasklet.
      
      (This may seem like an unlikely case to worry about, but underruns are
      all too common with the snd-usb-audio driver, which doesn't use
      URB_ISO_ASAP.)
      
      As part of the fix, some URBs may need to be given back when they are
      submitted.  This is necessary when the URB's scheduled slots all fall
      before the current value of ehci->last_iso_frame, and as an
      optimization we do it also when the slots all fall before the current
      frame number.
      
      As a second part of the fix, we may need to skip some but not all of
      an URB's packets.  This is necessary when some of the URB's scheduled
      slots fall before the current value of ehci->last_iso_frame and some
      of them fall after the current frame number.  A new field
      (first_packet) is added to struct ehci_iso_sched, to indicate how many
      packets should be skipped.
      Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
      CC: Ming Lei <tom.leiming@gmail.com>
      Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      46c73d1d
    • A
      USB: EHCI: code rearrangement in iso_stream_schedule() · e4e18cbd
      Alan Stern 提交于
      This patch interchanges the "if" and "else" branches of the big "if"
      statement in iso_stream_schedule(), in preparation for the next patch
      in this series.  That is, it changes
      
      	if (likely(!...)) {
      		A
      	} else {
      		B
      	}
      
      to
      
      	if (unlikely(...)) {
      		B
      	} else {
      		A
      	}
      Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
      Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e4e18cbd
    • A
      USB: see if URB comes from a completion handler · c7ccde6e
      Alan Stern 提交于
      Now that URBs can be completed inside tasklets, we need a way of
      determining whether a completion handler for a given endpoint is
      currently running.  Otherwise it's not possible to maintain the API
      guarantee about keeping isochronous streams synchronous when an
      underrun occurs.
      
      This patch adds a field and a routine to check whether a completion
      handler for a periodic endpoint is running.  At the moment no
      analogous routine appears to be necessary for async endpoints, but one
      can always be added.
      Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
      CC: Ming Lei <tom.leiming@gmail.com>
      Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      c7ccde6e
  2. 13 9月, 2013 1 次提交
  3. 31 8月, 2013 9 次提交
  4. 29 8月, 2013 1 次提交
    • S
      xhci: Fix warning introduced by disabling runtime PM. · e7ecf069
      Sarah Sharp 提交于
      The 0day build server caught a new build warning that is triggered when
      CONFIG_USB_DEFAULT_PERSIST is turned on:
      
      tree:   git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci.git for-usb-next
      head:   0730d52a
      commit: c8476fb8 [1/3] usb: xhci: Disable runtime PM suspend for quirky controllers
      config: i386-randconfig-r6-0826 (attached as .config)
      
      All warnings:
      
         drivers/usb/host/xhci.c: In function 'xhci_free_dev':
      >> drivers/usb/host/xhci.c:3560:17: warning: unused variable 'dev' [-Wunused-variable]
           struct device *dev = hcd->self.controller;
                          ^
         drivers/usb/host/xhci.c: In function 'xhci_alloc_dev':
      >> drivers/usb/host/xhci.c:3648:17: warning: unused variable 'dev' [-Wunused-variable]
           struct device *dev = hcd->self.controller;
                          ^
      
      vim +/dev +3560 drivers/usb/host/xhci.c
      
        3554   * disabled.  Free any HC data structures associated with that device.
        3555   */
        3556  void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
        3557  {
        3558          struct xhci_hcd *xhci = hcd_to_xhci(hcd);
        3559          struct xhci_virt_device *virt_dev;
      > 3560          struct device *dev = hcd->self.controller;
        3561          unsigned long flags;
        3562          u32 state;
        3563          int i, ret;
        3564
        3565  #ifndef CONFIG_USB_DEFAULT_PERSIST
        3566          /*
        3567           * We called pm_runtime_get_noresume when the device was attached.
        3568           * Decrement the counter here to allow controller to runtime suspend
        3569           * if no devices remain.
        3570           */
        3571          if (xhci->quirks & XHCI_RESET_ON_RESUME)
        3572                  pm_runtime_put_noidle(dev);
        3573  #endif
        3574
      ...
        3641  /*
        3642   * Returns 0 if the xHC ran out of device slots, the Enable Slot command
        3643   * timed out, or allocating memory failed.  Returns 1 on success.
        3644   */
        3645  int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
        3646  {
        3647          struct xhci_hcd *xhci = hcd_to_xhci(hcd);
      > 3648          struct device *dev = hcd->self.controller;
        3649          unsigned long flags;
        3650          int timeleft;
        3651          int ret;
      
      Fix this.
      Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
      Cc: Shawn Nematbakhsh <shawnn@chromium.org>
      e7ecf069
  5. 28 8月, 2013 26 次提交
新手
引导
客服 返回
顶部