From d5a7b406c529e4595ce03dc8f6dcf7fa36f106fa Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Fri, 4 Oct 2013 10:52:36 +0200 Subject: [PATCH] can: flexcan: flexcan_chip_start: fix regression, mark one MB for TX and abort pending TX MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit In patch 0d1862e can: flexcan: fix flexcan_chip_start() on imx6 the loop in flexcan_chip_start() that iterates over all mailboxes after the soft reset of the CAN core was removed. This loop put all mailboxes (even the ones marked as reserved 1...7) into EMPTY/INACTIVE mode. On mailboxes 8...63, this aborts any pending TX messages. After a cold boot there is random garbage in the mailboxes, which leads to spontaneous transmit of CAN frames during first activation. Further if the interface was disabled with a pending message (usually due to an error condition on the CAN bus), this message is retransmitted after enabling the interface again. This patch fixes the regression by: 1) Limiting the maximum number of used mailboxes to 8, 0...7 are used by the RX FIFO, 8 is used by TX. 2) Marking the TX mailbox as EMPTY/INACTIVE, so that any pending TX of that mailbox is aborted. Cc: linux-stable Cc: Lothar Waßmann Signed-off-by: Marc Kleine-Budde --- Reading git-format-patch failed