[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>

1 files changed, 20 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/context.c b/arch/powerpc/platforms/cell/spufs/context.c
index 290b10e45105..237e152d31dc 100644
--- a/arch/powerpc/platforms/cell/spufs/context.c
+++ b/arch/powerpc/platforms/cell/spufs/context.c
@@ -106,7 +106,17 @@ int put_spu_context(struct spu_context *ctx)
 void spu_forget(struct spu_context *ctx)
 {
 	struct mm_struct *mm;
-	spu_acquire_saved(ctx);
+
+	/*
+	 * This is basically an open-coded spu_acquire_saved, except that
+	 * we don't acquire the state mutex interruptible.
+	 */
+	mutex_lock(&ctx->state_mutex);
+	if (ctx->state != SPU_STATE_SAVED) {
+		set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
+		spu_deactivate(ctx);
+	}
+
 	mm = ctx->owner;
 	ctx->owner = NULL;
 	mmput(mm);
@@ -137,13 +147,20 @@ void spu_unmap_mappings(struct spu_context *ctx)
  * spu_acquire_saved - lock spu contex and make sure it is in saved state
  * @ctx:	spu contex to lock
  */
-void spu_acquire_saved(struct spu_context *ctx)
+int spu_acquire_saved(struct spu_context *ctx)
 {
-	spu_acquire(ctx);
+	int ret;
+
+	ret = spu_acquire(ctx);
+	if (ret)
+		return ret;
+
 	if (ctx->state != SPU_STATE_SAVED) {
 		set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
 		spu_deactivate(ctx);
 	}
+
+	return 0;
 }
 
 /**