[PATCH] arm: omap4: hsmmc: check for null pointer

[Balaji T K]

platform_device pdev can be NULL if CONFIG_MMC_OMAP_HS is not set.
Add check for NULL pointer

Fixes the following boot crash seen with omap4sdp and omap4panda
when MMC is disabled.

Unable to handle kernel NULL pointer dereference at virtual address 0000008c
pgd = c0004000
[0000008c] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0    Not tainted  (3.4.0-rc1-05971-ga4dfa82 #4)
PC is at omap_4430sdp_init+0x184/0x410
LR is at device_add+0x1a0/0x664

Signed-off-by: Balaji T K <balajitk at ti.com>
Reported-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
---
 arch/arm/mach-omap2/board-4430sdp.c    |    6 +++++-
 arch/arm/mach-omap2/board-omap4panda.c |    6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
index a39fc4b..1ce771d 100644
--- a/arch/arm/mach-omap2/board-4430sdp.c
+++ b/arch/arm/mach-omap2/board-4430sdp.c
@@ -526,8 +526,12 @@ static int __init omap4_twl6030_hsmmc_init(struct omap2_hsmmc_info *controllers)
 	struct omap2_hsmmc_info *c;
 
 	omap_hsmmc_init(controllers);
-	for (c = controllers; c->mmc; c++)
+	for (c = controllers; c->mmc; c++) {
+		/* pdev can be null if CONFIG_MMC_OMAP_HS is not set */
+		if (!c->pdev)
+			continue;
 		omap4_twl6030_hsmmc_set_late_init(&c->pdev->dev);
+	}
 
 	return 0;
 }
diff --git a/arch/arm/mach-omap2/board-omap4panda.c b/arch/arm/mach-omap2/board-omap4panda.c
index d8c0e89..104fd6d 100644
--- a/arch/arm/mach-omap2/board-omap4panda.c
+++ b/arch/arm/mach-omap2/board-omap4panda.c
@@ -278,8 +278,12 @@ static int __init omap4_twl6030_hsmmc_init(struct omap2_hsmmc_info *controllers)
 	struct omap2_hsmmc_info *c;
 
 	omap_hsmmc_init(controllers);
-	for (c = controllers; c->mmc; c++)
+	for (c = controllers; c->mmc; c++) {
+		/* pdev can be null if CONFIG_MMC_OMAP_HS is not set */
+		if (!c->pdev)
+			continue;
 		omap4_twl6030_hsmmc_set_late_init(&c->pdev->dev);
+	}
 
 	return 0;
 }
-- 
1.7.0.4