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authorAlan Stern <stern@rowland.harvard.edu>2011-02-23 15:28:18 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-25 11:38:32 -0800
commit969e3033ae7733a0af8f7742ca74cd16c0857e71 (patch)
tree2aa76d00720d20304f318b8a7fd247c804d0e2cf /include/linux/usb
parent22ced6874fc47bb051e7460443e454ca8efc457e (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 'include/linux/usb')
-rw-r--r--include/linux/usb/serial.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index c9049139a7a..45f3b9db425 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -191,7 +191,8 @@ static inline void usb_set_serial_data(struct usb_serial *serial, void *data)
* @id_table: pointer to a list of usb_device_id structures that define all
* of the devices this structure can support.
* @num_ports: the number of different ports this device will have.
- * @bulk_in_size: bytes to allocate for bulk-in buffer (0 = end-point size)
+ * @bulk_in_size: minimum number of bytes to allocate for bulk-in buffer
+ * (0 = end-point size)
* @bulk_out_size: bytes to allocate for bulk-out buffer (0 = end-point size)
* @calc_num_ports: pointer to a function to determine how many ports this
* device has dynamically. It will be called after the probe()