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extcon: max8997: Check the pointer of platform data to protect null pointer error

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This patch check the pointer of platform data to protect
kernel panic when platform data is not used and code clean.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Chanwoo Choi 2013-02-18 10:15:03 +09:00
parent f6161aa153
commit 810d601f07
1 changed files with 33 additions and 21 deletions
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54
drivers/extcon/extcon-max8997.c
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@ -712,29 +712,45 @@ static int max8997_muic_probe(struct platform_device *pdev)
goto err_irq;
}
/* Initialize registers according to platform data */
if (pdata->muic_pdata) {
struct max8997_muic_platform_data *mdata = info->muic_pdata;
struct max8997_muic_platform_data *muic_pdata
= pdata->muic_pdata;
for (i = 0; i < mdata->num_init_data; i++) {
max8997_write_reg(info->muic, mdata->init_data[i].addr,
mdata->init_data[i].data);
/* Initialize registers according to platform data */
for (i = 0; i < muic_pdata->num_init_data; i++) {
max8997_write_reg(info->muic,
muic_pdata->init_data[i].addr,
muic_pdata->init_data[i].data);
}
}
/*
* Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
* h/w path of COMP2/COMN1 on CONTROL1 register.
*/
if (pdata->muic_pdata->path_uart)
info->path_uart = pdata->muic_pdata->path_uart;
else
/*
* Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
* h/w path of COMP2/COMN1 on CONTROL1 register.
*/
if (muic_pdata->path_uart)
info->path_uart = muic_pdata->path_uart;
else
info->path_uart = CONTROL1_SW_UART;
if (muic_pdata->path_usb)
info->path_usb = muic_pdata->path_usb;
else
info->path_usb = CONTROL1_SW_USB;
/*
* Default delay time for detecting cable state
* after certain time.
*/
if (muic_pdata->detcable_delay_ms)
delay_jiffies =
msecs_to_jiffies(muic_pdata->detcable_delay_ms);
else
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
} else {
info->path_uart = CONTROL1_SW_UART;
if (pdata->muic_pdata->path_usb)
info->path_usb = pdata->muic_pdata->path_usb;
else
info->path_usb = CONTROL1_SW_USB;
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
}
/* Set initial path for UART */
max8997_muic_set_path(info, info->path_uart, true);
@ -751,10 +767,6 @@ static int max8997_muic_probe(struct platform_device *pdev)
* driver should notify cable state to upper layer.
*/
INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
if (pdata->muic_pdata->detcable_delay_ms)
delay_jiffies = msecs_to_jiffies(pdata->muic_pdata->detcable_delay_ms);
else
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
schedule_delayed_work(&info->wq_detcable, delay_jiffies);
return 0;