[POWERPC] spufs: make state_mutex interruptible
Make most places that use spu_acquire/spu_acquire_saved interruptible,
this allows getting out of the spufs code when e.g. pressing ctrl+c.
There are a few places where we get called e.g. from spufs teardown
routines were we can't simply err out so these are left with a comment.
For now I've also not touched the poll routines because it's open what
libspe would expect in terms of interrupted system calls.
Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/cell/spufs/fault.c b/arch/powerpc/platforms/cell/spufs/fault.c
index 720e111..825001c 100644
--- a/arch/powerpc/platforms/cell/spufs/fault.c
+++ b/arch/powerpc/platforms/cell/spufs/fault.c
@@ -107,7 +107,7 @@
u64 ea, dsisr, access;
unsigned long flags;
unsigned flt = 0;
- int ret;
+ int ret, ret2;
/*
* dar and dsisr get passed from the registers
@@ -146,7 +146,14 @@
if (ret)
ret = spu_handle_mm_fault(current->mm, ea, dsisr, &flt);
- spu_acquire(ctx);
+ /*
+ * If spu_acquire fails due to a pending signal we just want to return
+ * EINTR to userspace even if that means missing the dma restart or
+ * updating the page fault statistics.
+ */
+ ret2 = spu_acquire(ctx);
+ if (ret2)
+ goto out;
/*
* Clear dsisr under ctxt lock after handling the fault, so that
@@ -177,6 +184,7 @@
} else
spufs_handle_event(ctx, ea, SPE_EVENT_SPE_DATA_STORAGE);
+ out:
spuctx_switch_state(ctx, SPU_UTIL_SYSTEM);
return ret;
}