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powerpc/vdso32: Fallback on getres syscall when clock is unknown

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There are other clocks than the standard ones, for instance
per process clocks. Therefore, being above the last standard clock
doesn't mean it is a bad clock. So, fallback to syscall instead
of returning -EINVAL inconditionaly.

Fixes: e33ffc956b ("powerpc/vdso32: implement clock_getres entirely")
Cc: stable@vger.kernel.org # v5.6+
Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Link: https://lore.kernel.org/r/7316a9e2c0c2517923eb4b0411c4a08d15e675a4.1589017281.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-05-09 09:42:14 +00:00 committed by Michael Ellerman
parent 4833ce06e6
commit e963b7a28b
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/kernel/vdso32/gettimeofday.S
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@ -218,11 +218,11 @@ V_FUNCTION_BEGIN(__kernel_clock_getres)
blr
/*
* invalid clock
* syscall fallback
*/
99:
li r3, EINVAL
crset so
li r0,__NR_clock_getres
sc
blr
.cfi_endproc
V_FUNCTION_END(__kernel_clock_getres)