cxl: Rework context lifetimes

This reworks contexts lifetimes a bit to enable the kernel API where we may
want to reuse contexts. Here we will want to start and stop contexts without
freeing them.

Start context does the get pid & ctx so stop context will need to do the puts.
Here we move put pid & ctx to the detach context path which will become part of
the stop context path.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 3 insertions, 3 deletions

diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index 7d857b7..2a4c80a 100644
--- a/drivers/misc/cxl/context.c
+++ b/drivers/misc/cxl/context.c
@@ -186,6 +186,9 @@ int __detach_context(struct cxl_context *ctx)
 		return -EBUSY;
 
 	WARN_ON(cxl_detach_process(ctx));
+	flush_work(&ctx->fault_work); /* Only needed for dedicated process */
+	put_pid(ctx->pid);
+	cxl_ctx_put();
 	return 0;
 }
 
@@ -204,7 +207,6 @@ void cxl_context_detach(struct cxl_context *ctx)
 		return;
 
 	afu_release_irqs(ctx, ctx);
-	flush_work(&ctx->fault_work); /* Only needed for dedicated process */
 	wake_up_all(&ctx->wq);
 }
 
@@ -245,7 +247,6 @@ static void reclaim_ctx(struct rcu_head *rcu)
 	free_page((u64)ctx->sstp);
 	ctx->sstp = NULL;
 
-	put_pid(ctx->pid);
 	kfree(ctx);
 }
 
diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index 676e2c8..c16bd6f 100644
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -128,7 +128,6 @@ static int afu_release(struct inode *inode, struct file *file)
 	 */
 	cxl_context_free(ctx);
 
-	cxl_ctx_put();
 	return 0;
 }