linux-kernel - [PATCH v2 02/10] EDAC/mc: Use int type for parameters of edac_mc

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Date:   Wed, 22 Apr 2020 13:58:06 +0200
From:   Robert Richter <rrichter@...vell.com>
To:     Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>
CC:     James Morse <james.morse@....com>,
        Aristeu Rozanski <aris@...hat.com>,
        Robert Richter <rrichter@...vell.com>,
        Matthias Brugger <mbrugger@...e.com>,
        <linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 02/10] EDAC/mc: Use int type for parameters of edac_mc_alloc()

Most iterators use int type as index. mci->mc_idx is also type int. So
use int type for parameters of edac_mc_alloc(). Extend the range check
to check for negative values. There is a type cast now when assigning
variable n_layers to mci->n_layer, it is safe due to the range check.

While at it, rename the users of edac_mc_alloc() to mc_idx as this
fits better here.

Signed-off-by: Robert Richter <rrichter@...vell.com>
---
 drivers/edac/edac_mc.c | 7 +++----
 drivers/edac/edac_mc.h | 6 +++---
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 107d7c4de933..57d1d356d69c 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -444,8 +444,7 @@ static int edac_mc_alloc_dimms(struct mem_ctl_info *mci)
 	return 0;
 }
 
-struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
-				   unsigned int n_layers,
+struct mem_ctl_info *edac_mc_alloc(int mc_idx, int n_layers,
 				   struct edac_mc_layer *layers,
 				   unsigned int sz_pvt)
 {
@@ -456,7 +455,7 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
 	void *pvt, *ptr = NULL;
 	bool per_rank = false;
 
-	if (WARN_ON(n_layers > EDAC_MAX_LAYERS || n_layers == 0))
+	if (WARN_ON(mc_idx < 0 || n_layers < 1 || n_layers > EDAC_MAX_LAYERS))
 		return NULL;
 
 	/*
@@ -505,7 +504,7 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
 	pvt = sz_pvt ? (((char *)mci) + ((unsigned long)pvt)) : NULL;
 
 	/* setup index and various internal pointers */
-	mci->mc_idx = mc_num;
+	mci->mc_idx = mc_idx;
 	mci->tot_dimms = tot_dimms;
 	mci->pvt_info = pvt;
 	mci->n_layers = n_layers;
diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index 881b00eadf7a..4815f50afea0 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -98,7 +98,7 @@ do {									\
 /**
  * edac_mc_alloc() - Allocate and partially fill a struct &mem_ctl_info.
  *
- * @mc_num:		Memory controller number
+ * @mc_idx:		Memory controller number
  * @n_layers:		Number of MC hierarchy layers
  * @layers:		Describes each layer as seen by the Memory Controller
  * @sz_pvt:		size of private storage needed
@@ -122,8 +122,8 @@ do {									\
  *	On success, return a pointer to struct mem_ctl_info pointer;
  *	%NULL otherwise
  */
-struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
-				   unsigned int n_layers,
+struct mem_ctl_info *edac_mc_alloc(int mc_idx,
+				   int n_layers,
 				   struct edac_mc_layer *layers,
 				   unsigned int sz_pvt);
 
-- 
2.20.1