diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2011-02-23 15:28:18 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-25 11:38:32 -0800 |
| commit | 969e3033ae7733a0af8f7742ca74cd16c0857e71 (patch) | |
| tree | 2aa76d00720d20304f318b8a7fd247c804d0e2cf /drivers/usb/serial | |
| parent | 22ced6874fc47bb051e7460443e454ca8efc457e (diff) | |
USB: serial drivers need to use larger bulk-in buffers
When a driver doesn't know how much data a device is going to send,
the buffer size should be at least as big as the endpoint's maxpacket
value. The serial drivers don't follow this rule; many of them
request only 256-byte bulk-in buffers. As a result, they suffer
overflow errors if a high-speed device wants to send a lot of data,
because high-speed bulk endpoints are required to have a maxpacket
size of 512.
This patch (as1450) fixes the problem by using the driver's
bulk_in_size value as a minimum, always allocating buffers no smaller
than the endpoint's maxpacket size.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Flynn Marquardt <flynn@flynnux.de>
CC: <stable@kernel.org> [after .39-rc1 is out]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 546a52179be..2ff90a9c8f4 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -911,9 +911,8 @@ int usb_serial_probe(struct usb_interface *interface, dev_err(&interface->dev, "No free urbs available\n"); goto probe_error; } - buffer_size = serial->type->bulk_in_size; - if (!buffer_size) - buffer_size = le16_to_cpu(endpoint->wMaxPacketSize); + buffer_size = max_t(int, serial->type->bulk_in_size, + le16_to_cpu(endpoint->wMaxPacketSize)); port->bulk_in_size = buffer_size; port->bulk_in_endpointAddress = endpoint->bEndpointAddress; port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL); |