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| author | Alan Stern <stern@rowland.harvard.edu> | 2007-05-11 10:19:04 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-05-22 23:45:49 -0700 |
| commit | b89ee19ae6c0b5a0d9facca780b53959fbadd123 (patch) | |
| tree | d777fc2bda8cce83cd2104c7e74857b501025c04 /drivers/usb | |
| parent | d984abc97e400d68a09729b80060fe0ec591eb16 (diff) | |
| download | kernel_samsung_smdk4412-b89ee19ae6c0b5a0d9facca780b53959fbadd123.zip kernel_samsung_smdk4412-b89ee19ae6c0b5a0d9facca780b53959fbadd123.tar.gz kernel_samsung_smdk4412-b89ee19ae6c0b5a0d9facca780b53959fbadd123.tar.bz2 | |
USB: remove short initial timeout for device descriptor fetch
This patch (as905) removes a micro-optimization from the hub port
initialization code. Previously we had been using a short timeout on
the first attempt the read the device descriptor; now we will use the
standard timeout length.
It's not clear that the short timeout ever provided any benefit. And
now we know of one case where it actually hurts: The device can't meet
the short timeout and then it gets terminally confused.
This fixes Bugzilla #8444.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/hub.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f6b74a6..6a6e4f8 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2201,14 +2201,9 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, continue; } - /* Use a short timeout the first time through, - * so that recalcitrant full-speed devices with - * 8- or 16-byte ep0-maxpackets won't slow things - * down tremendously by NAKing the unexpectedly - * early status stage. Also, retry on all errors; - * some devices are flakey. - * 255 is for WUSB devices, we actually need to use 512. - * WUSB1.0[4.8.1]. + /* Retry on all errors; some devices are flakey. + * 255 is for WUSB devices, we actually need to use + * 512 (WUSB1.0[4.8.1]). */ for (j = 0; j < 3; ++j) { buf->bMaxPacketSize0 = 0; @@ -2216,7 +2211,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, USB_DT_DEVICE << 8, 0, buf, GET_DESCRIPTOR_BUFSIZE, - (i ? USB_CTRL_GET_TIMEOUT : 1000)); + USB_CTRL_GET_TIMEOUT); switch (buf->bMaxPacketSize0) { case 8: case 16: case 32: case 64: case 255: if (buf->bDescriptorType == |