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Matt Reimer e2f04e1894 [ARM] 3546/1: PATCH: subtle lost interrupts bug on i.MX ... Patch from Matt Reimer There is a subtle bug in the GPIO interrupt status register handling in arch/arm/mach-imx/irq.c:imx_gpio_ack_irq(). The documentation states that a 1 should be written to the relevant bit to acknowledge a GPIO interrupt, but that is not what the code does. The problem is that the |= writes back 1s for all the *other* interrupts represented in the register, so interrupts could get lost. For example, if interrupts are pending for GPIO B10 and B12, ISR_B would have the value 0x00001400. Then when the interrupt code handles GPIO B10, it eventually calls imx_gpio_ack_irq(IRQ_GPIOB(10)), which effectively does this: ISR_B |= 1 << 10; with the result that (0x00001400 | 0x00000400) is written, clearing the interrupt status bits for *both* GPIO B10 and B12. The fix is to write 1s only for the interrupts we want to clear. The same problem seems to be occurring in the DMA code; this patch does not address those issues. Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Matt Reimer <mreimer@vpop.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>		19 years ago
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Kconfig	[PATCH] ARM: select PCI, ISA and ISA_DMA	20 years ago
Makefile	Linux-2.6.12-rc2	20 years ago
Makefile.boot	Linux-2.6.12-rc2	20 years ago
dma.c	[ARM] 3444/1: i.MX: Scatter-gather DMA emulation for i.MX/MX1	19 years ago
generic.c	[ARM] 3490/1: i.MX: move uart resources to board files	19 years ago
generic.h	Linux-2.6.12-rc2	20 years ago
irq.c	[ARM] 3546/1: PATCH: subtle lost interrupts bug on i.MX	19 years ago
leds-mx1ads.c	[ARM] Don't include mach-types.h unnecessarily	20 years ago
leds.c	Linux-2.6.12-rc2	20 years ago
leds.h	Linux-2.6.12-rc2	20 years ago
mx1ads.c	[ARM] 3501/1: i.MX: fix lowlevel debug macros	19 years ago
time.c	[PATCH] ARM: Add SA_TIMER flag to timer interrupts	20 years ago