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resource: Clean it up a bit

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- Drop BUG_ON()s and do normal error handling instead, in
  find_next_iomem_res().

- Align function arguments on opening braces.

- Get rid of local var sibling_only in find_next_iomem_res().

- Shorten unnecessarily long first_level_children_only arg name.

Signed-off-by: Borislav Petkov <bp@suse.de>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Brijesh Singh <brijesh.singh@amd.com>
CC: Dan Williams <dan.j.williams@intel.com>
CC: H. Peter Anvin <hpa@zytor.com>
CC: Lianbo Jiang <lijiang@redhat.com>
CC: Takashi Iwai <tiwai@suse.de>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Tom Lendacky <thomas.lendacky@amd.com>
CC: Vivek Goyal <vgoyal@redhat.com>
CC: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
CC: bhe@redhat.com
CC: dan.j.williams@intel.com
CC: dyoung@redhat.com
CC: kexec@lists.infradead.org
CC: mingo@redhat.com
Link: <new submission>
This commit is contained in:
Borislav Petkov 2018-10-09 16:11:21 +02:00
parent 010a93bf97
commit b69c2e20f6
1 changed files with 26 additions and 29 deletions
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55
kernel/resource.c
View file

@ -328,25 +328,23 @@ EXPORT_SYMBOL(release_resource);
* -1. * -1.
* *
* This function walks the whole tree and not just first level children * This function walks the whole tree and not just first level children
* unless @first_level_children_only is true. * unless @first_lvl is true.
*/ */
static int find_next_iomem_res(resource_size_t start, resource_size_t end, static int find_next_iomem_res(resource_size_t start, resource_size_t end,
unsigned long flags, unsigned long desc, unsigned long flags, unsigned long desc,
bool first_level_children_only, bool first_lvl, struct resource *res)
struct resource *res)
{ {
struct resource *p; struct resource *p;
bool sibling_only = false;
BUG_ON(!res); if (!res)
BUG_ON(start >= end); return -EINVAL;
if (first_level_children_only) if (start >= end)
sibling_only = true; return -EINVAL;
read_lock(&resource_lock); read_lock(&resource_lock);
for (p = iomem_resource.child; p; p = next_resource(p, sibling_only)) { for (p = iomem_resource.child; p; p = next_resource(p, first_lvl)) {
if ((p->flags & flags) != flags) if ((p->flags & flags) != flags)
continue; continue;
if ((desc != IORES_DESC_NONE) && (desc != p->desc)) if ((desc != IORES_DESC_NONE) && (desc != p->desc))
@ -373,15 +371,14 @@ static int find_next_iomem_res(resource_size_t start, resource_size_t end,
static int __walk_iomem_res_desc(resource_size_t start, resource_size_t end, static int __walk_iomem_res_desc(resource_size_t start, resource_size_t end,
unsigned long flags, unsigned long desc, unsigned long flags, unsigned long desc,
bool first_level_children_only, void *arg, bool first_lvl, void *arg,
int (*func)(struct resource *, void *)) int (*func)(struct resource *, void *))
{ {
struct resource res; struct resource res;
int ret = -1; int ret = -1;
while (start < end && while (start < end &&
!find_next_iomem_res(start, end, flags, desc, !find_next_iomem_res(start, end, flags, desc, first_lvl, &res)) {
first_level_children_only, &res)) {
ret = (*func)(&res, arg); ret = (*func)(&res, arg);
if (ret) if (ret)
break; break;
@ -392,7 +389,7 @@ static int __walk_iomem_res_desc(resource_size_t start, resource_size_t end,
return ret; return ret;
} }
/* /**
* Walks through iomem resources and calls func() with matching resource * Walks through iomem resources and calls func() with matching resource
* ranges. This walks through whole tree and not just first level children. * ranges. This walks through whole tree and not just first level children.
* All the memory ranges which overlap start,end and also match flags and * All the memory ranges which overlap start,end and also match flags and
@ -421,7 +418,7 @@ EXPORT_SYMBOL_GPL(walk_iomem_res_desc);
* ranges. * ranges.
*/ */
int walk_system_ram_res(u64 start, u64 end, void *arg, int walk_system_ram_res(u64 start, u64 end, void *arg,
int (*func)(struct resource *, void *)) int (*func)(struct resource *, void *))
{ {
unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
@ -450,7 +447,7 @@ int walk_mem_res(u64 start, u64 end, void *arg,
* It is to be used only for System RAM. * It is to be used only for System RAM.
*/ */
int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg, int (*func)(unsigned long, unsigned long, void *)) void *arg, int (*func)(unsigned long, unsigned long, void *))
{ {
resource_size_t start, end; resource_size_t start, end;
unsigned long flags; unsigned long flags;
@ -646,8 +643,8 @@ static int find_resource(struct resource *root, struct resource *new,
* @constraint: the size and alignment constraints to be met. * @constraint: the size and alignment constraints to be met.
*/ */
static int reallocate_resource(struct resource *root, struct resource *old, static int reallocate_resource(struct resource *root, struct resource *old,
resource_size_t newsize, resource_size_t newsize,
struct resource_constraint *constraint) struct resource_constraint *constraint)
{ {
int err=0; int err=0;
struct resource new = *old; struct resource new = *old;
@ -960,7 +957,7 @@ skip:
* Existing children of the resource are assumed to be immutable. * Existing children of the resource are assumed to be immutable.
*/ */
int adjust_resource(struct resource *res, resource_size_t start, int adjust_resource(struct resource *res, resource_size_t start,
resource_size_t size) resource_size_t size)
{ {
int result; int result;
@ -971,9 +968,9 @@ int adjust_resource(struct resource *res, resource_size_t start,
} }
EXPORT_SYMBOL(adjust_resource); EXPORT_SYMBOL(adjust_resource);
static void __init __reserve_region_with_split(struct resource *root, static void __init
resource_size_t start, resource_size_t end, __reserve_region_with_split(struct resource *root, resource_size_t start,
const char *name) resource_size_t end, const char *name)
{ {
struct resource *parent = root; struct resource *parent = root;
struct resource *conflict; struct resource *conflict;
@ -1032,9 +1029,9 @@ static void __init __reserve_region_with_split(struct resource *root,
} }
void __init reserve_region_with_split(struct resource *root, void __init
resource_size_t start, resource_size_t end, reserve_region_with_split(struct resource *root, resource_size_t start,
const char *name) resource_size_t end, const char *name)
{ {
int abort = 0; int abort = 0;
@ -1160,7 +1157,7 @@ EXPORT_SYMBOL(__request_region);
* The described resource region must match a currently busy region. * The described resource region must match a currently busy region.
*/ */
void __release_region(struct resource *parent, resource_size_t start, void __release_region(struct resource *parent, resource_size_t start,
resource_size_t n) resource_size_t n)
{ {
struct resource **p; struct resource **p;
resource_size_t end; resource_size_t end;
@ -1222,7 +1219,7 @@ EXPORT_SYMBOL(__release_region);
* simplicity. Enhance this logic when necessary. * simplicity. Enhance this logic when necessary.
*/ */
int release_mem_region_adjustable(struct resource *parent, int release_mem_region_adjustable(struct resource *parent,
resource_size_t start, resource_size_t size) resource_size_t start, resource_size_t size)
{ {
struct resource **p; struct resource **p;
struct resource *res; struct resource *res;
@ -1398,9 +1395,9 @@ static int devm_region_match(struct device *dev, void *res, void *match_data)
this->start == match->start && this->n == match->n; this->start == match->start && this->n == match->n;
} }
struct resource * __devm_request_region(struct device *dev, struct resource *
struct resource *parent, resource_size_t start, __devm_request_region(struct device *dev, struct resource *parent,
resource_size_t n, const char *name) resource_size_t start, resource_size_t n, const char *name)
{ {
struct region_devres *dr = NULL; struct region_devres *dr = NULL;
struct resource *res; struct resource *res;