On Thu, Mar 02, 2017 at 06:23:19PM -0300, Sergio Prado wrote:
> We are getting a NULL pointer dereference when working with external
> interrupts on s3c24xx:
>
> Unable to handle kernel NULL pointer dereference at virtual address 000000a8
> pgd = c0104000
> [000000a8] *pgd=00000000
> Internal error: Oops: 5 [#1] ARM
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper Not tainted 4.10.0-rc8mini2440-sub-00047-g0722f57bfae9-dirty #3
> Hardware name: Samsung S3C2416 (Flattened Device Tree)
> task: c07399f8 task.stack: c0734000
> PC is at s3c24xx_demux_eint4_7+0x24/0x10c
> LR is at s3c24xx_demux_eint4_7+0x108/0x10c
>
> The problem is in the function s3c24xx_demux_eint() when dereferencing
> bank->eint_base.
>
> At this point, we cannot get the bank pointer from the irq_desc
> structure since it is pointing to the hardware irq, not virq.
>
> So let's get the bank pointer directly from data->drvdata.
>
> This is a regression from commit 8b1bd11c1f8f529057369c5b3702d13fd24e2765.
Checkpatch should complain here about commit format.
>
> Tested on FriendlyARM mini2440.
>
Please add:
Fixes: 8b1bd11c1f8f ("pinctrl: samsung: Add the support the multiple IORESOURCE_MEM for one pin-bank")
Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Sergio Prado <sergio.prado@xxxxxxxxxxxxxx>
> ---
> drivers/pinctrl/samsung/pinctrl-s3c24xx.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pinctrl/samsung/pinctrl-s3c24xx.c b/drivers/pinctrl/samsung/pinctrl-s3c24xx.c
> index b82a003546ae..1b8d887796e8 100644
> --- a/drivers/pinctrl/samsung/pinctrl-s3c24xx.c
> +++ b/drivers/pinctrl/samsung/pinctrl-s3c24xx.c
> @@ -356,8 +356,8 @@ static inline void s3c24xx_demux_eint(struct irq_desc *desc,
> {
> struct s3c24xx_eint_data *data = irq_desc_get_handler_data(desc);
> struct irq_chip *chip = irq_desc_get_chip(desc);
> - struct irq_data *irqd = irq_desc_get_irq_data(desc);
> - struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
> + struct samsung_pinctrl_drv_data *d = data->drvdata;
> + struct samsung_pin_bank *bank = d->pin_banks;
I think 'pin_banks' point to all banks of given controller not to the
currently accessed one.
Best regards,
Krzysztof
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