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extcon: max77693: Fix bug of wrong pointer when platform data is not …
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…used

This patch fix wrong pointer of platform data. If each machine set
platform data for h/w path or delay time of workqueue, this driver
happen kernel panic related to null pointer.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
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@chanwoochoi
chanwoochoi committed Mar 13, 2013
1 parent 810d601 commit 190d7cf
Showing 1 changed file with 52 additions and 38 deletions.
90 changes: 52 additions & 38 deletions drivers/extcon/extcon-max77693.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1045,7 +1045,6 @@ static int max77693_muic_probe(struct platform_device *pdev)
{
struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
struct max77693_platform_data *pdata = dev_get_platdata(max77693->dev);
struct max77693_muic_platform_data *muic_pdata = pdata->muic_data;
struct max77693_muic_info *info;
int delay_jiffies;
int ret;
Expand Down Expand Up @@ -1145,44 +1144,63 @@ static int max77693_muic_probe(struct platform_device *pdev)
goto err_irq;
}

/* Initialize MUIC register by using platform data */
for (i = 0 ; i < muic_pdata->num_init_data ; i++) {
enum max77693_irq_source irq_src = MAX77693_IRQ_GROUP_NR;

max77693_write_reg(info->max77693->regmap_muic,
muic_pdata->init_data[i].addr,
muic_pdata->init_data[i].data);

switch (muic_pdata->init_data[i].addr) {
case MAX77693_MUIC_REG_INTMASK1:
irq_src = MUIC_INT1;
break;
case MAX77693_MUIC_REG_INTMASK2:
irq_src = MUIC_INT2;
break;
case MAX77693_MUIC_REG_INTMASK3:
irq_src = MUIC_INT3;
break;
if (pdata->muic_data) {
struct max77693_muic_platform_data *muic_pdata = pdata->muic_data;

/* Initialize MUIC register by using platform data */
for (i = 0 ; i < muic_pdata->num_init_data ; i++) {
enum max77693_irq_source irq_src
= MAX77693_IRQ_GROUP_NR;

max77693_write_reg(info->max77693->regmap_muic,
muic_pdata->init_data[i].addr,
muic_pdata->init_data[i].data);

switch (muic_pdata->init_data[i].addr) {
case MAX77693_MUIC_REG_INTMASK1:
irq_src = MUIC_INT1;
break;
case MAX77693_MUIC_REG_INTMASK2:
irq_src = MUIC_INT2;
break;
case MAX77693_MUIC_REG_INTMASK3:
irq_src = MUIC_INT3;
break;
}

if (irq_src < MAX77693_IRQ_GROUP_NR)
info->max77693->irq_masks_cur[irq_src]
= muic_pdata->init_data[i].data;
}

if (irq_src < MAX77693_IRQ_GROUP_NR)
info->max77693->irq_masks_cur[irq_src]
= 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 (muic_pdata->path_uart)
info->path_uart = muic_pdata->path_uart;
else
info->path_uart = CONTROL1_SW_UART;

/*
* 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;

if (muic_pdata->path_usb)
info->path_usb = muic_pdata->path_usb;
else
/*
* 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_usb = CONTROL1_SW_USB;
info->path_uart = CONTROL1_SW_UART;
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
}

/* Set initial path for UART */
max77693_muic_set_path(info, info->path_uart, true);
Expand All @@ -1208,10 +1226,6 @@ static int max77693_muic_probe(struct platform_device *pdev)
* driver should notify cable state to upper layer.
*/
INIT_DELAYED_WORK(&info->wq_detcable, max77693_muic_detect_cable_wq);
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);
schedule_delayed_work(&info->wq_detcable, delay_jiffies);

return ret;
Expand Down

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