[PATCH v2 02/10] EDAC/mc: Use int type for parameters of edac_mc_alloc()

From: Robert Richter
Date: Wed Apr 22 2020 - 07:59:54 EST


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@xxxxxxxxxxx>
---
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