Patch "USB: uas: Reduce can_queue to MAX_CMNDS" has been added to the 4.5-stable tree

Patch "USB: uas: Reduce can_queue to MAX_CMNDS" has been added to the 4.5-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    USB: uas: Reduce can_queue to MAX_CMNDS

to the 4.5-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:
     usb-uas-reduce-can_queue-to-max_cmnds.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 55ff8cfbc4e12a7d2187df523938cc671fbebdd1 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 7 Mar 2016 20:11:52 +0100
Subject: USB: uas: Reduce can_queue to MAX_CMNDS

From: Hans de Goede <hdegoede@redhat.com>

commit 55ff8cfbc4e12a7d2187df523938cc671fbebdd1 upstream.

The uas driver can never queue more then MAX_CMNDS (- 1) tags and tags
are shared between luns, so there is no need to claim that we can_queue
some random large number.

Not claiming that we can_queue 65536 commands, fixes the uas driver
failing to initialize while allocating the tag map with a "Page allocation
failure (order 7)" error on systems which have been running for a while
and thus have fragmented memory.

Reported-and-tested-by: Yves-Alexis Perez <corsac@corsac.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/storage/uas.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -812,7 +812,7 @@ static struct scsi_host_template uas_hos
 	.slave_configure = uas_slave_configure,
 	.eh_abort_handler = uas_eh_abort_handler,
 	.eh_bus_reset_handler = uas_eh_bus_reset_handler,
-	.can_queue = 65536,	/* Is there a limit on the _host_ ? */
+	.can_queue = MAX_CMNDS,
 	.this_id = -1,
 	.sg_tablesize = SG_NONE,
 	.skip_settle_delay = 1,


Patches currently in stable-queue which might be from hdegoede@redhat.com are

queue-4.5/pwc-add-usb-id-for-philips-spc880nc-webcam.patch
queue-4.5/usb-uas-reduce-can_queue-to-max_cmnds.patch