[v2,4/7] ghes_edac: avoid multiple calls to dmi_walk()

Commit Message

Borislav Petkov Aug. 16, 2017, 5:31 p.m. UTC

On Wed, Aug 16, 2017 at 10:22:49AM -0400, Steven Rostedt wrote:
> Maybe keep that original mutex just in case.

Let's do the elegant thing:

---

Patch

diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index d4089c2980ef..386e04a7bda0 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -28,6 +28,7 @@  struct ghes_edac_pvt {
 	char msg[80];
 };
 
+static atomic_t ghes_init = ATOMIC_INIT(0);
 static struct ghes_edac_pvt *ghes_pvt;
 
 /*
@@ -426,7 +427,7 @@  int ghes_edac_register(struct ghes *ghes, struct device *dev)
 	/*
 	 * We have only one logical memory controller to which all DIMMs belong.
 	 */
-	if (ghes_pvt)
+	if (atomic_inc_return(&ghes_init) > 1)
 		return 0;
 
 	/* Get the number of DIMMs */