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| author | Greg Kurz <groug@kaod.org> | 2019-09-11 17:52:18 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-09-12 09:27:05 +1000 |
| commit | 6ccb4ac2bf8a35c694ead92f8ac5530a16e8f2c8 (patch) | |
| tree | e2680d33f9b4590f7e3ecf70c7af8310a333d433 /arch/powerpc/sysdev | |
| parent | 92c94dfb69e350471473fd3075c74bc68150879e (diff) | |
| download | linux-6ccb4ac2bf8a35c694ead92f8ac5530a16e8f2c8.tar.gz linux-6ccb4ac2bf8a35c694ead92f8ac5530a16e8f2c8.tar.bz2 linux-6ccb4ac2bf8a35c694ead92f8ac5530a16e8f2c8.zip | |
powerpc/xive: Fix bogus error code returned by OPAL
There's a bug in skiboot that causes the OPAL_XIVE_ALLOCATE_IRQ call
to return the 32-bit value 0xffffffff when OPAL has run out of IRQs.
Unfortunatelty, OPAL return values are signed 64-bit entities and
errors are supposed to be negative. If that happens, the linux code
confusingly treats 0xffffffff as a valid IRQ number and panics at some
point.
A fix was recently merged in skiboot:
e97391ae2bb5 ("xive: fix return value of opal_xive_allocate_irq()")
but we need a workaround anyway to support older skiboots already
in the field.
Internally convert 0xffffffff to OPAL_RESOURCE which is the usual error
returned upon resource exhaustion.
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821713818.1985334.14123187368108582810.stgit@bahia.lan
Diffstat (limited to 'arch/powerpc/sysdev')
| -rw-r--r-- | arch/powerpc/sysdev/xive/native.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/xive/native.c b/arch/powerpc/sysdev/xive/native.c index 4b61e44f0171..e9481468ebd8 100644 --- a/arch/powerpc/sysdev/xive/native.c +++ b/arch/powerpc/sysdev/xive/native.c @@ -245,6 +245,17 @@ static bool xive_native_match(struct device_node *node) return of_device_is_compatible(node, "ibm,opal-xive-vc"); } +static s64 opal_xive_allocate_irq(u32 chip_id) +{ + s64 irq = opal_xive_allocate_irq_raw(chip_id); + + /* + * Old versions of skiboot can incorrectly return 0xffffffff to + * indicate no space, fix it up here. + */ + return irq == 0xffffffff ? OPAL_RESOURCE : irq; +} + #ifdef CONFIG_SMP static int xive_native_get_ipi(unsigned int cpu, struct xive_cpu *xc) { |