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powerpc/perf: Pass struct imc_events as a parameter to imc_parse_event() 

Remove the allocation of struct imc_events from imc_parse_event().
Instead pass imc_events as a parameter to imc_parse_event(), which is
a pointer to a slot in the array allocated in
update_events_in_group().

Reported-by: Dan Carpenter ("powerpc/perf: Fix a sizeof() typo so we allocate less memory")
Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anju T Sudhakar 2017-12-11 11:28:37 +05:30 committed by Michael Ellerman
parent ed8e443fee
commit 8b4e6deaff
2 changed files with 41 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/imc-pmu.h
View File

@ -71,7 +71,7 @@ struct imc_events {
struct imc_pmu {
struct pmu pmu;
struct imc_mem_info *mem_info;
struct imc_events **events;
struct imc_events *events;
/*
* Attribute groups for the PMU. Slot 0 used for
* format attribute, slot 1 used for cpusmask attribute,

66
arch/powerpc/perf/imc-pmu.c
View File

@ -116,17 +116,13 @@ static struct attribute *device_str_attr_create(const char *name, const char *st
return &attr->attr.attr;
}
struct imc_events *imc_parse_event(struct device_node *np, const char *scale,
const char *unit, const char *prefix, u32 base)
static int imc_parse_event(struct device_node *np, const char *scale,
const char *unit, const char *prefix,
u32 base, struct imc_events *event)
{
struct imc_events *event;
const char *s;
u32 reg;
event = kzalloc(sizeof(struct imc_events), GFP_KERNEL);
if (!event)
return NULL;
if (of_property_read_u32(np, "reg", &reg))
goto error;
/* Add the base_reg value to the "reg" */
@ -157,14 +153,32 @@ struct imc_events *imc_parse_event(struct device_node *np, const char *scale,
goto error;
}
return event;
return 0;
error:
kfree(event->unit);
kfree(event->scale);
kfree(event->name);
kfree(event);
return -EINVAL;
}
return NULL;
/*
* imc_free_events: Function to cleanup the events list, having
* "nr_entries".
*/
static void imc_free_events(struct imc_events *events, int nr_entries)
{
int i;
/* Nothing to clean, return */
if (!events)
return;
for (i = 0; i < nr_entries; i++) {
kfree(events[i].unit);
kfree(events[i].scale);
kfree(events[i].name);
}
kfree(events);
}
/*
@ -176,9 +190,8 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
struct attribute_group *attr_group;
struct attribute **attrs, *dev_str;
struct device_node *np, *pmu_events;
struct imc_events *ev;
u32 handle, base_reg;
int i=0, j=0, ct;
int i = 0, j = 0, ct, ret;
const char *prefix, *g_scale, *g_unit;
const char *ev_val_str, *ev_scale_str, *ev_unit_str;
@ -216,15 +229,17 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
ct = 0;
/* Parse the events and update the struct */
for_each_child_of_node(pmu_events, np) {
ev = imc_parse_event(np, g_scale, g_unit, prefix, base_reg);
if (ev)
pmu->events[ct++] = ev;
ret = imc_parse_event(np, g_scale, g_unit, prefix, base_reg, &pmu->events[ct]);
if (!ret)
ct++;
}
/* Allocate memory for attribute group */
attr_group = kzalloc(sizeof(*attr_group), GFP_KERNEL);
if (!attr_group)
if (!attr_group) {
imc_free_events(pmu->events, ct);
return -ENOMEM;
}
/*
* Allocate memory for attributes.
@ -237,31 +252,31 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
attrs = kcalloc(((ct * 3) + 1), sizeof(struct attribute *), GFP_KERNEL);
if (!attrs) {
kfree(attr_group);
kfree(pmu->events);
imc_free_events(pmu->events, ct);
return -ENOMEM;
}
attr_group->name = "events";
attr_group->attrs = attrs;
do {
ev_val_str = kasprintf(GFP_KERNEL, "event=0x%x", pmu->events[i]->value);
dev_str = device_str_attr_create(pmu->events[i]->name, ev_val_str);
ev_val_str = kasprintf(GFP_KERNEL, "event=0x%x", pmu->events[i].value);
dev_str = device_str_attr_create(pmu->events[i].name, ev_val_str);
if (!dev_str)
continue;
attrs[j++] = dev_str;
if (pmu->events[i]->scale) {
ev_scale_str = kasprintf(GFP_KERNEL, "%s.scale",pmu->events[i]->name);
dev_str = device_str_attr_create(ev_scale_str, pmu->events[i]->scale);
if (pmu->events[i].scale) {
ev_scale_str = kasprintf(GFP_KERNEL, "%s.scale", pmu->events[i].name);
dev_str = device_str_attr_create(ev_scale_str, pmu->events[i].scale);
if (!dev_str)
continue;
attrs[j++] = dev_str;
}
if (pmu->events[i]->unit) {
ev_unit_str = kasprintf(GFP_KERNEL, "%s.unit",pmu->events[i]->name);
dev_str = device_str_attr_create(ev_unit_str, pmu->events[i]->unit);
if (pmu->events[i].unit) {
ev_unit_str = kasprintf(GFP_KERNEL, "%s.unit", pmu->events[i].name);
dev_str = device_str_attr_create(ev_unit_str, pmu->events[i].unit);
if (!dev_str)
continue;
@ -272,7 +287,6 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
/* Save the event attribute */
pmu->attr_groups[IMC_EVENT_ATTR] = attr_group;
kfree(pmu->events);
return 0;
}