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| author | David Brownell <david-b@pacbell.net> | 2008-10-21 23:34:23 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-10-22 19:40:06 +0100 |
| commit | 085eefb5948bb43020792f31406da2ee2ef4e924 (patch) | |
| tree | d01aa745ccf7cc1755b19b30b3ce760cdbc445be /arch/arm/mach-at91/gpio.c | |
| parent | f20e3b5fe7ead0615309433260b9784d8da0bbbd (diff) | |
| download | linux-085eefb5948bb43020792f31406da2ee2ef4e924.tar.gz linux-085eefb5948bb43020792f31406da2ee2ef4e924.tar.bz2 linux-085eefb5948bb43020792f31406da2ee2ef4e924.zip | |
[ARM] 5316/1: AT91: oops (regression) fix on gpio irq
From: David Brownell <dbrownell@users.sourceforge.net>
The "5298/1: Drop desc_handle_irq()" patch went overboard
and deleted an essential line of code, causing all AT91
GPIO interrupts to oops (in irq). Trimmed example:
Unable to handle kernel NULL pointer dereference at virtual address 000000c4
...
PC is at gpio_irq_handler+0x78/0xd0
LR is at gpio_irq_handler+0x38/0xd0
...
Backtrace:
[<c0029884>] (gpio_irq_handler+0x0/0xd0) from [<c0020054>] (__exception_text_start+0x54/0x7c)
[<c0020000>] (__exception_text_start+0x0/0x7c) from [<c00209ec>] (__irq_svc+0x2c/0x60)
Exception stack(0xc1c1de00 to 0xc1c1de48)
[<c01f4ca8>] (_spin_unlock_irq+0x0/0x3c) from [<c01389f8>] (at91ether_open+0x220/0x318)
[<c01387d8>] (at91ether_open+0x0/0x318) from [<c018caa4>] (dev_open+0xa8/0x10c)
[<c018c9fc>] (dev_open+0x0/0x10c) from [<c018b874>] (dev_change_flags+0x98/0x164)
[<c018b7dc>] (dev_change_flags+0x0/0x164) from [<c0019f8c>] (ip_auto_config+0x164/0xe28)
[<c0019e28>] (ip_auto_config+0x0/0xe28) from [<c0020318>] (__exception_text_end+0x60/0x180)
[<c00202b8>] (__exception_text_end+0x0/0x180) from [<c0008738>] (kernel_init+0x70/0xd8)
[<c00086c8>] (kernel_init+0x0/0xd8) from [<c00398e0>] (do_exit+0x0/0x6ac)
This patch restores the missing line'o'code.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-at91/gpio.c')
| -rw-r--r-- | arch/arm/mach-at91/gpio.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c index 7e5ebb5bdd17..9b0447c3d59b 100644 --- a/arch/arm/mach-at91/gpio.c +++ b/arch/arm/mach-at91/gpio.c @@ -404,6 +404,7 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc) } pin = bank->chipbase; + gpio = &irq_desc[pin]; while (isr) { if (isr & 1) { |