This is a note to let you know that I've just added the patch titled
rapidio/tsi721: fix inbound doorbell interrupt handling
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rapidio-tsi721-fix-inbound-doorbell-interrupt-handling.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 3670e7e12e582c6d67761275d148171feb7a9004 Mon Sep 17 00:00:00 2001
From: Alexandre Bounine <[email protected]>
Date: Tue, 21 Aug 2012 16:16:11 -0700
Subject: rapidio/tsi721: fix inbound doorbell interrupt handling
From: Alexandre Bounine <[email protected]>
commit 3670e7e12e582c6d67761275d148171feb7a9004 upstream.
Make sure that there is no doorbell messages left behind due to disabled
interrupts during inbound doorbell processing.
The most common case for this bug is loss of rionet JOIN messages in
systems with three or more rionet participants and MSI or MSI-X enabled.
As result, requests for packet transfers may finish with "destination
unreachable" error message.
This patch is applicable to kernel versions starting from v3.2.
Signed-off-by: Alexandre Bounine <[email protected]>
Cc: Matt Porter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/rapidio/devices/tsi721.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -439,6 +439,9 @@ static void tsi721_db_dpc(struct work_st
" info %4.4x\n", DBELL_SID(idb.bytes),
DBELL_TID(idb.bytes), DBELL_INF(idb.bytes));
}
+
+ wr_ptr = ioread32(priv->regs +
+ TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
}
iowrite32(rd_ptr & (IDB_QSIZE - 1),
@@ -449,6 +452,10 @@ static void tsi721_db_dpc(struct work_st
regval |= TSI721_SR_CHINT_IDBQRCV;
iowrite32(regval,
priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
+
+ wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
+ if (wr_ptr != rd_ptr)
+ schedule_work(&priv->idb_work);
}
/**
Patches currently in stable-queue which might be from [email protected]
are
queue-3.4/rapidio-tsi721-fix-inbound-doorbell-interrupt-handling.patch
queue-3.4/rapidio-tsi721-fix-unused-variable-compiler-warning.patch
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