Patch "fpga: altera-hps2fpga: fix multiple init of l3_remap_lock" has been added to the 4.13-stable tree

[<gregkh@linuxfoundation.org>]

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

    fpga: altera-hps2fpga: fix multiple init of l3_remap_lock

to the 4.13-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:
     fpga-altera-hps2fpga-fix-multiple-init-of-l3_remap_lock.patch
and it can be found in the queue-4.13 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 4ae2bd4b3ada3dfd80ca8110b4f567752966ca1e Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 1 Aug 2017 21:20:54 -0500
Subject: fpga: altera-hps2fpga: fix multiple init of l3_remap_lock

From: Ian Abbott <abbotti@mev.co.uk>

commit 4ae2bd4b3ada3dfd80ca8110b4f567752966ca1e upstream.

The global spinlock `l3_remap_lock` is reinitialized every time the
"probe" function `alt_fpga_bridge_probe()` is called.  It should only be
initialized once.  Use `DEFINE_SPINLOCK()` to initialize it statically.

Fixes: e5f8efa5c8bf ("ARM: socfpga: fpga bridge driver support")
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-By: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/fpga/altera-hps2fpga.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/fpga/altera-hps2fpga.c
+++ b/drivers/fpga/altera-hps2fpga.c
@@ -66,7 +66,7 @@ static int alt_hps2fpga_enable_show(stru
 
 /* The L3 REMAP register is write only, so keep a cached value. */
 static unsigned int l3_remap_shadow;
-static spinlock_t l3_remap_lock;
+static DEFINE_SPINLOCK(l3_remap_lock);
 
 static int _alt_hps2fpga_enable_set(struct altera_hps2fpga_data *priv,
 				    bool enable)
@@ -171,8 +171,6 @@ static int alt_fpga_bridge_probe(struct
 		return -EBUSY;
 	}
 
-	spin_lock_init(&l3_remap_lock);
-
 	if (!of_property_read_u32(dev->of_node, "bridge-enable", &enable)) {
 		if (enable > 1) {
 			dev_warn(dev, "invalid bridge-enable %u > 1\n", enable);


Patches currently in stable-queue which might be from abbotti@mev.co.uk are

queue-4.13/fpga-altera-hps2fpga-fix-multiple-init-of-l3_remap_lock.patch