linux-kernel - [PATCH v2 1/3] x86: intel-mid: sfi_handle_*_dev() should check for pdata error code

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Date:	Fri, 20 Dec 2013 17:15:11 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, david.a.cohen@...ux.intel.com
Subject: [PATCH v2 1/3] x86: intel-mid: sfi_handle_*_dev() should check for pdata error code

When Intel MID finds a match between SFI table from FW and registered
SFI devices, it will execute platform initialization code, acquire
platform data and register platform device to probe the driver.
But if platform initialization code fails, Intel MID will still register
platform device even though it's likely it won't work properly.
This patch handles this error condition in more graceful way.

Since 'NULL' is a valid return value, this patch makes
sfi_handle_*_dev() functions to use IS_ERR() to validate returned pdata.
Then, it prevents sfi_handle_*_dev() to register device in case
intel_mid_sfi_get_pdata() failed to execute.

Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
---
 arch/x86/platform/intel-mid/sfi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/platform/intel-mid/sfi.c b/arch/x86/platform/intel-mid/sfi.c
index 80a52288555c..1d5d20b088fa 100644
--- a/arch/x86/platform/intel-mid/sfi.c
+++ b/arch/x86/platform/intel-mid/sfi.c
@@ -337,6 +337,8 @@ static void __init sfi_handle_ipc_dev(struct sfi_device_table_entry *pentry,
 	pr_debug("IPC bus, name = %16.16s, irq = 0x%2x\n",
 		pentry->name, pentry->irq);
 	pdata = intel_mid_sfi_get_pdata(dev, pentry);
+	if (IS_ERR(pdata))
+		return;
 
 	pdev = platform_device_alloc(pentry->name, 0);
 	if (pdev == NULL) {
@@ -370,6 +372,8 @@ static void __init sfi_handle_spi_dev(struct sfi_device_table_entry *pentry,
 		spi_info.chip_select);
 
 	pdata = intel_mid_sfi_get_pdata(dev, &spi_info);
+	if (IS_ERR(pdata))
+		return;
 
 	spi_info.platform_data = pdata;
 	if (dev->delay)
@@ -395,6 +399,8 @@ static void __init sfi_handle_i2c_dev(struct sfi_device_table_entry *pentry,
 		i2c_info.addr);
 	pdata = intel_mid_sfi_get_pdata(dev, &i2c_info);
 	i2c_info.platform_data = pdata;
+	if (IS_ERR(pdata))
+		return;
 
 	if (dev->delay)
 		intel_scu_i2c_device_register(pentry->host_num, &i2c_info);
-- 
1.8.4.2

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