This is a note to let you know that I've just added the patch titled
cciss: fix lost command issue
to the 2.6.33-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.33.git;a=summary
The filename of the patch is:
cciss-fix-lost-command-issue.patch
and it can be found in the queue-2.6.33 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.33 longterm
tree,
please let <[email protected]> know about it.
>From 1ddd5049545e0aa1a0ed19bca4d9c9c3ce1ac8a2 Mon Sep 17 00:00:00 2001
From: Bud Brown <[email protected]>
Date: Wed, 23 Mar 2011 20:47:11 +0100
Subject: cciss: fix lost command issue
From: Bud Brown <[email protected]>
commit 1ddd5049545e0aa1a0ed19bca4d9c9c3ce1ac8a2 upstream.
Under certain workloads a command may seem to get lost. IOW, the Smart Array
thinks all commands have been completed but we still have commands in our
completion queue. This may lead to system instability, filesystems going
read-only, or even panics depending on the affected filesystem. We add an
extra read to force the write to complete.
Testing shows this extra read avoids the problem.
Signed-off-by: Mike Miller <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/block/cciss.h | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -181,6 +181,7 @@ static void SA5_submit_command( ctlr_inf
printk("Sending %x - down to controller\n", c->busaddr );
#endif /* CCISS_DEBUG */
writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
+ readl(h->vaddr + SA5_REQUEST_PORT_OFFSET);
h->commands_outstanding++;
if ( h->commands_outstanding > h->max_outstanding)
h->max_outstanding = h->commands_outstanding;
Patches currently in longterm-queue-2.6.33 which might be from
[email protected] are
/home/gregkh/linux/longterm/longterm-queue-2.6.33/queue-2.6.33/cciss-fix-lost-command-issue.patch
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