linux_dsm_epyc7002/arch/arm
Nicolas Pitre fd4b9b3650 [ARM] 5401/1: Orion: fix edge triggered GPIO interrupt support
The GPIO interrupts can be configured as either level triggered or edge
triggered, with a default of level triggered.  When an edge triggered
interrupt is requested, the gpio_irq_set_type method is called which
currently switches the given IRQ descriptor between two struct irq_chip
instances: orion_gpio_irq_level_chip and orion_gpio_irq_edge_chip. This
happens via __setup_irq() which also calls irq_chip_set_defaults() to
assign default methods to uninitialized ones.  The problem is that
irq_chip_set_defaults() is called before the irq_chip reference is
switched, leaving the new irq_chip (orion_gpio_irq_edge_chip in this
case) with uninitialized methods such as chip->startup() causing a kernel
oops.

Many solutions are possible, such as making irq_chip_set_defaults() global
and calling it from gpio_irq_set_type(), or calling __irq_set_trigger()
before irq_chip_set_defaults() in __setup_irq().  But those require
modifications to the generic IRQ code which might have adverse effect on
other architectures, and that would still be a fragile arrangement.
Manually copying the missing methods from within gpio_irq_set_type()
would be really ugly and it would break again the day new methods with
automatic defaults are added.

A better solution is to have a single irq_chip instance which can deal
with both edge and level triggered interrupts.  It is also a good idea
to switch the IRQ handler instead, as the edge IRQ handler allows for
one edge IRQ event to be queued as the IRQ is actually masked only when
that second IRQ is received, at which point the hardware can queue an
additional IRQ event, making edge triggered interrupts a bit more
reliable.

Tested-by: Martin Michlmayr <tbm@cyrius.com>

Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-02-17 22:37:09 +00:00
..
boot Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 into devel 2008-12-02 22:07:40 +00:00
common [ARM] clkdev: fix clock matching 2009-01-24 11:41:20 +00:00
configs [ARM] 5390/1: AT91: Watchdog fixes 2009-02-14 16:01:57 +00:00
include/asm byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
kernel [ARM] Storage class should be before const qualifier 2009-02-10 09:59:19 +00:00
lib Merge branch 'clps7500' into devel 2008-11-27 12:39:43 +00:00
mach-aaec2000 arm: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:43 -08:00
mach-at91 [ARM] 5400/1: Add support for inverted rdy_busy pin for Atmel nand device controller 2009-02-16 21:40:39 +00:00
mach-clps711x [ARM] clps711x: fix warning in edb7211-mm.c 2009-01-08 16:29:42 +00:00
mach-davinci USB: musb_hdrc: another davinci buildfix (otg related) 2009-01-27 16:15:32 -08:00
mach-ebsa110 [ARM] Hide ISA DMA API when ISA_DMA_API is unset 2008-11-29 18:42:40 +00:00
mach-ep93xx arm: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:43 -08:00
mach-footbridge Merge branch 'devel' 2009-01-08 22:01:49 +00:00
mach-h720x [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
mach-imx [ARM] i.MX add missing include 2009-01-12 12:14:40 +01:00
mach-integrator libata-sff: fix incorrect EH message 2009-01-26 06:36:16 -05:00
mach-iop13xx [ARM] Hide ISA DMA API when ISA_DMA_API is unset 2008-11-29 18:42:40 +00:00
mach-iop32x [ARM] Hide ISA DMA API when ISA_DMA_API is unset 2008-11-29 18:42:40 +00:00
mach-iop33x [ARM] fix missing includes for iop33x and sa1100_ir 2008-12-01 23:01:19 +00:00
mach-ixp4xx Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
mach-ixp23xx [ARM] Hide ISA DMA API when ISA_DMA_API is unset 2008-11-29 18:42:40 +00:00
mach-ixp2000 [ARM] Hide ISA DMA API when ISA_DMA_API is unset 2008-11-29 18:42:40 +00:00
mach-kirkwood [ARM] 5401/1: Orion: fix edge triggered GPIO interrupt support 2009-02-17 22:37:09 +00:00
mach-ks8695 [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
mach-l7200 [ARM] Add a common typesafe __io implementation 2008-11-30 11:45:54 +00:00
mach-lh7a40x arm: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:43 -08:00
mach-loki [ARM] Hide ISA DMA API when ISA_DMA_API is unset 2008-11-29 18:42:40 +00:00
mach-msm [ARM] msm: fix build errors 2009-01-28 10:19:52 +00:00
mach-mv78xx0 [ARM] 5401/1: Orion: fix edge triggered GPIO interrupt support 2009-02-17 22:37:09 +00:00
mach-mx1 [ARM] MXC: remove dependency to other include files from irqs.h 2008-12-18 16:40:11 +01:00
mach-mx2 [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
mach-mx3 [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
mach-netx [ARM] fix netx 2009-01-08 16:29:44 +00:00
mach-ns9xxx Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
mach-omap1 ARM: OMAP: Fix hsmmc init, v2 2009-01-29 08:57:16 -08:00
mach-omap2 [ARM] omap: fix _omap2_clksel_get_src_field() 2009-02-14 13:25:38 +00:00
mach-orion5x [ARM] 5401/1: Orion: fix edge triggered GPIO interrupt support 2009-02-17 22:37:09 +00:00
mach-pnx4008 [ARM] fix pnx4008 2009-01-08 16:29:43 +00:00
mach-pxa [ARM] pxa: stop and disable IRQ for each DMA channels at startup 2009-01-21 11:29:19 +08:00
mach-realview [ARM] Fix realview build 2009-01-08 16:29:41 +00:00
mach-rpc [ARM] give RiscPC a NR_IRQS definition and remove default 2008-11-29 19:14:31 +00:00
mach-s3c24a0/include/mach [ARM] S3C24A0: Remove duplicate <mach/io.h> file 2008-12-18 16:35:59 +00:00
mach-s3c2400 [ARM] remove a common set of __virt_to_bus definitions 2008-11-28 15:36:49 +00:00
mach-s3c2410 [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
mach-s3c2412 [ARM] S3C: Remove unnecessary <linux/delay.h> includes 2008-12-18 16:36:02 +00:00
mach-s3c2440 [ARM] 5358/1: AT2440EVB: Use new include path of mci.h 2009-01-08 16:29:41 +00:00
mach-s3c2442 [ARM] Arrange for platforms to select appropriate CPU support 2008-11-27 12:38:00 +00:00
mach-s3c2443 [ARM] S3C: Remove unnecessary <linux/delay.h> includes 2008-12-18 16:36:02 +00:00
mach-s3c6400 [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
mach-s3c6410 Merge branch 'next-s3c64xx-device' into next-merged 2008-12-18 16:17:37 +00:00
mach-sa1100 rename platform_driver name "flash" to "sa1100-mtd" 2009-01-31 01:21:58 +01:00
mach-shark [ARM] Rename ISA mach/dma.h header to mach/isa-dma.h 2008-11-29 18:49:55 +00:00
mach-versatile arm: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:43 -08:00
mach-w90x900 [ARM] w90x900: fix build errors and warnings 2009-01-12 13:51:03 +00:00
mm [ARM] 5366/1: fix shared memory coherency with VIVT L1 + L2 caches 2009-01-28 16:55:00 +00:00
nwfpe [ARM] Convert asm/uaccess.h to linux/uaccess.h 2008-09-06 11:35:55 +01:00
oprofile cpumask: make irq_set_affinity() take a const struct cpumask 2008-12-13 21:20:26 +10:30
plat-iop [ARM] iop: iop3xx needs registers mapped uncached+unbuffered 2008-11-09 11:18:36 +00:00
plat-mxc mmc: Add a MX2/MX3 specific SDHC driver 2009-02-02 20:57:05 +01:00
plat-omap ARM: OMAP: Fix hsmmc init, v2 2009-01-29 08:57:16 -08:00
plat-orion [ARM] 5401/1: Orion: fix edge triggered GPIO interrupt support 2009-02-17 22:37:09 +00:00
plat-s3c [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
plat-s3c24xx [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c 2009-01-08 16:29:42 +00:00
plat-s3c64xx [ARM] S3C64XX: Fix EINT group macro definition 2009-01-08 16:25:24 +00:00
tools [ARM] Update mach-types 2008-11-30 16:39:42 +00:00
vfp [ARM] 5349/1: VFP: Add PM code to save and restore current VFP state 2008-12-18 21:21:34 +00:00
Kconfig Staging: Kconfig for ARCH=arm,8300, cris 2009-01-06 13:51:38 -08:00
Kconfig-nommu [ARM] 4532/1: allow configuration of processor ID 2007-10-12 23:43:02 +01:00
Kconfig.debug [ARM] CONFIG_DEBUG_STACK_USAGE 2008-01-26 14:50:06 +00:00
Makefile Merge branch 'next-merged' of git://aeryn.fluff.org.uk/bjdooks/linux into devel 2008-12-18 22:15:30 +00:00