linux-kernel - [PATCH 4.9 049/152] MIPS: Lantiq: fix missing xbar kernel panic

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Message-Id: <20170410164202.581129741@linuxfoundation.org>
Date:   Mon, 10 Apr 2017 18:41:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hauke Mehrtens <hauke@...ke-m.de>,
        John Crispin <john@...ozen.org>, james.hogan@...tec.com,
        arnd@...db.de, sergei.shtylyov@...entembedded.com,
        linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 4.9 049/152] MIPS: Lantiq: fix missing xbar kernel panic

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hauke Mehrtens <hauke@...ke-m.de>

commit 6ef90877eee63a0d03e83183bb44b64229b624e6 upstream.

Commit 08b3c894e565 ("MIPS: lantiq: Disable xbar fpi burst mode")
accidentally requested the resources from the pmu address region
instead of the xbar registers region, but the check for the return
value of request_mem_region() was wrong. Commit 98ea51cb0c8c ("MIPS:
Lantiq: Fix another request_mem_region() return code check") fixed the
check of the return value of request_mem_region() which made the kernel
panics.
This patch now makes use of the correct memory region for the cross bar.

Fixes: 08b3c894e565 ("MIPS: lantiq: Disable xbar fpi burst mode")
Signed-off-by: Hauke Mehrtens <hauke@...ke-m.de>
Cc: John Crispin <john@...ozen.org>
Cc: james.hogan@...tec.com
Cc: arnd@...db.de
Cc: sergei.shtylyov@...entembedded.com
Cc: john@...ozen.org
Cc: linux-mips@...ux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15751
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/lantiq/xway/sysctrl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/lantiq/xway/sysctrl.c
+++ b/arch/mips/lantiq/xway/sysctrl.c
@@ -467,7 +467,7 @@ void __init ltq_soc_init(void)
 
 		if (!np_xbar)
 			panic("Failed to load xbar nodes from devicetree");
-		if (of_address_to_resource(np_pmu, 0, &res_xbar))
+		if (of_address_to_resource(np_xbar, 0, &res_xbar))
 			panic("Failed to get xbar resources");
 		if (request_mem_region(res_xbar.start, resource_size(&res_xbar),
 			res_xbar.name) < 0)