[ 3.5.yuz extended stable ] Patch "storvsc: Account for in-transit packets in the RESET path" has been added to staging queue

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Thu Nov 15 06:01:42 UTC 2012

This is a note to let you know that I have just added a patch titled

    storvsc: Account for in-transit packets in the RESET path

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.yuz tree, see



>From 8ce9efb38a7728bab76cf40bf79e5200c6e0953e Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys at microsoft.com>
Date: Tue, 2 Oct 2012 11:03:31 -0700
Subject: [PATCH] storvsc: Account for in-transit packets in the RESET path

commit 5c1b10ab7f93d24f29b5630286e323d1c5802d5c upstream.

Properly account for I/O in transit before returning from the RESET call.
In the absense of this patch, we could have a situation where the host may
respond to a command that was issued prior to the issuance of the RESET
command at some arbitrary time after responding to the RESET command.
Currently, the host does not do anything with the RESET command.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: James Bottomley <JBottomley at Parallels.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
 drivers/scsi/storvsc_drv.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 528d52b..0144078 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1221,7 +1221,12 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
 	 * At this point, all outstanding requests in the adapter
 	 * should have been flushed out and return to us
+	 * There is a potential race here where the host may be in
+	 * the process of responding when we return from here.
+	 * Just wait for all in-transit packets to be accounted for
+	 * before we return from here.
+	storvsc_wait_to_drain(stor_device);

 	return SUCCESS;

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