linux-kernel - [PATCH v3 3/6] staging/fwserial: Simplify max payload calculation

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Message-Id: <1359424669-5723-4-git-send-email-peter@hurleysoftware.com>
Date:	Mon, 28 Jan 2013 20:57:46 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org,
	linux1394-devel@...ts.sourceforge.net,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v3 3/6] staging/fwserial: Simplify max payload calculation


Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/staging/fwserial/fwserial.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/fwserial/fwserial.h b/drivers/staging/fwserial/fwserial.h
index e157318..953ece6 100644
--- a/drivers/staging/fwserial/fwserial.h
+++ b/drivers/staging/fwserial/fwserial.h
@@ -377,8 +377,8 @@ static inline void fwtty_bind_console(struct fwtty_port *port,
  */
 static inline int link_speed_to_max_payload(unsigned speed)
 {
-	speed = clamp(speed, (unsigned) SCODE_100, (unsigned) SCODE_800);
-	return 1 << (speed + 9);
+	/* Max async payload is 4096 - see IEEE 1394-2008 tables 6-4, 16-18 */
+	return min(512 << speed, 4096);
 }
 
 #endif /* _FIREWIRE_FWSERIAL_H */
-- 
1.8.1.1

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