From: Michael Neuling Date: Sun, 9 Jun 2013 11:23:18 +0000 (+1000) Subject: powerpc/tm: Fix return of 32bit rt signals to active transactions X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=55e4341850ac56e63a3eefe9583a9000042164fa;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git powerpc/tm: Fix return of 32bit rt signals to active transactions Currently we only restore signals which are transactionally suspended but it's possible that the transaction can be restored even when it's active. Most likely this will result in a transactional rollback by the hardware as the transaction will have been doomed by an earlier treclaim. The current code is a legacy of earlier kernel implementations which did software rollback of active transactions in the kernel. That code has now gone but we didn't correctly fix up this part of the signals code which still makes assumptions based on having software rollback. This changes the signal return code to always restore both contexts on 32 bit rt signal return. Signed-off-by: Michael Neuling cc: stable@vger.kernel.org (v3.9+) Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c index 364cb1e7300e..0f83122e6676 100644 --- a/arch/powerpc/kernel/signal_32.c +++ b/arch/powerpc/kernel/signal_32.c @@ -1245,7 +1245,7 @@ long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR])) goto bad; - if (MSR_TM_SUSPENDED(msr_hi<<32)) { + if (MSR_TM_ACTIVE(msr_hi<<32)) { /* We only recheckpoint on return if we're * transaction. */