linux-kernel - [PATCH] powerpc/fsl_pci: Fix pci stack build bug with FRAME

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Date:	Tue, 20 Jan 2015 14:03:49 -0600
From:	Kim Phillips <kim.phillips@...escale.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Scott Wood <scottwood@...escale.com>,
	Wang Dongsheng <dongsheng.wang@...escale.com>,
	Anton Blanchard <anton@...ba.org>,
	Himangi Saraogi <himangi774@...il.com>,
	Aaron Sierra <asierra@...-inc.com>
CC:	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: [PATCH] powerpc/fsl_pci: Fix pci stack build bug with FRAME_WARN

Fix this:

  CC      arch/powerpc/sysdev/fsl_pci.o
arch/powerpc/sysdev/fsl_pci.c: In function 'fsl_pcie_check_link':
arch/powerpc/sysdev/fsl_pci.c:91:1: error: the frame size of 1360 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

when configuring FRAME_WARN, by converting the allocation from the
stack to the heap.  We use GFP_ATOMIC since this function can be
called with interrupts disabled.

Signed-off-by: Kim Phillips <kim.phillips@...escale.com>
---
 arch/powerpc/sysdev/fsl_pci.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 6455c1e..635d743 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -69,11 +69,13 @@ static int fsl_pcie_check_link(struct pci_controller *hose)
 
 	if (hose->indirect_type & PPC_INDIRECT_TYPE_FSL_CFG_REG_LINK) {
 		if (hose->ops->read == fsl_indirect_read_config) {
-			struct pci_bus bus;
-			bus.number = hose->first_busno;
-			bus.sysdata = hose;
-			bus.ops = hose->ops;
-			indirect_read_config(&bus, 0, PCIE_LTSSM, 4, &val);
+			struct pci_bus *bus;
+			bus = kmalloc(sizeof(*bus), GFP_ATOMIC);
+			bus->number = hose->first_busno;
+			bus->sysdata = hose;
+			bus->ops = hose->ops;
+			indirect_read_config(bus, 0, PCIE_LTSSM, 4, &val);
+			kfree(bus);
 		} else
 			early_read_config_dword(hose, 0, 0, PCIE_LTSSM, &val);
 		if (val < PCIE_LTSSM_L0)
-- 
2.2.2

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