From 5ef8224aaa9220bfecb362f0802cf78aad47c02a Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 4 Jan 2006 20:31:24 +0100 Subject: [PATCH] [PATCH] spufs: serialize sys_spu_run per spu During an earlier cleanup, we lost the serialization of multiple spu_run calls performed on the same spu_context. In order to get this back, introduce a mutex in the spu_context that is held inside of spu_run. Noticed by Al Viro. Signed-off-by: Arnd Bergmann Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/cell/spufs/context.c | 1 + arch/powerpc/platforms/cell/spufs/file.c | 15 ++++++++++----- arch/powerpc/platforms/cell/spufs/spufs.h | 1 + 3 files changed, 12 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/platforms/cell/spufs/context.c b/arch/powerpc/platforms/cell/spufs/context.c index 903c35d19577..c5cd55ac848d 100644 --- a/arch/powerpc/platforms/cell/spufs/context.c +++ b/arch/powerpc/platforms/cell/spufs/context.c @@ -43,6 +43,7 @@ struct spu_context *alloc_spu_context(struct address_space *local_store) spin_lock_init(&ctx->mmio_lock); kref_init(&ctx->kref); init_rwsem(&ctx->state_sema); + init_MUTEX(&ctx->run_sema); init_waitqueue_head(&ctx->ibox_wq); init_waitqueue_head(&ctx->wbox_wq); init_waitqueue_head(&ctx->stop_wq); diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c index 9738de727f32..e63426822fd5 100644 --- a/arch/powerpc/platforms/cell/spufs/file.c +++ b/arch/powerpc/platforms/cell/spufs/file.c @@ -620,8 +620,12 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx, { int ret; - if ((ret = spu_run_init(ctx, npc, status)) != 0) - return ret; + if (down_interruptible(&ctx->run_sema)) + return -ERESTARTSYS; + + ret = spu_run_init(ctx, npc, status); + if (ret) + goto out; do { ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, status)); @@ -629,9 +633,8 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx, break; if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) { ret = spu_reacquire_runnable(ctx, npc, status); - if (ret) { - return ret; - } + if (ret) + goto out; continue; } ret = spu_process_events(ctx); @@ -645,6 +648,8 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx, ret = *status; spu_yield(ctx); +out: + up(&ctx->run_sema); return ret; } diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h index 420953b58881..b50474450819 100644 --- a/arch/powerpc/platforms/cell/spufs/spufs.h +++ b/arch/powerpc/platforms/cell/spufs/spufs.h @@ -48,6 +48,7 @@ struct spu_context { enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state; struct rw_semaphore state_sema; + struct semaphore run_sema; struct mm_struct *owner; -- 2.20.1