staging/fwserial: Assume firmware is OHCI-complaint
Devices which are OHCI v1.0/ v1.1/ v1.2-draft compliant or
RFC 2734 compliant are required by specification to support
max_rec of 8 (512 bytes) or more. Accept reported value.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c
index 815c011..59e90e6 100644
--- a/drivers/staging/fwserial/fwserial.c
+++ b/drivers/staging/fwserial/fwserial.c
@@ -174,10 +174,15 @@
#define dump_profile(m, stats)
#endif
-/* Returns the max receive packet size for the given node */
+/*
+ * Returns the max receive packet size for the given node
+ * Devices which are OHCI v1.0/ v1.1/ v1.2-draft or RFC 2734 compliant
+ * are required by specification to support max_rec of 8 (512 bytes) or more.
+ */
static inline int device_max_receive(struct fw_device *fw_device)
{
- return 1 << (clamp_t(int, fw_device->max_rec, 8U, 11U) + 1);
+ /* see IEEE 1394-2008 table 8-8 */
+ return min(2 << fw_device->max_rec, 4096);
}
static void fwtty_log_tx_error(struct fwtty_port *port, int rcode)