[PATCH 08/10] staging: fsl-mc: remove debug WARN_ONs doubling error checks

From: laurentiu.tudor
Date: Fri Nov 17 2017 - 08:41:08 EST

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In reply to: laurentiu.tudor: "[PATCH 10/10] staging: fsl-mc: use device_type instead of strcmp()"
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From: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>

A lot of error checks are doubled by debug WARN_ONs. Given that the
driver was thoroughly debugged and is in a stable state, it's time to
drop them.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
---
drivers/staging/fsl-mc/bus/dprc-driver.c | 20 ++---
drivers/staging/fsl-mc/bus/fsl-mc-allocator.c | 86 +++++++++++-----------
drivers/staging/fsl-mc/bus/fsl-mc-bus.c | 8 +-
drivers/staging/fsl-mc/bus/fsl-mc-msi.c | 14 ++--
.../staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c | 4 +-
drivers/staging/fsl-mc/bus/mc-io.c | 13 ++--
drivers/staging/fsl-mc/bus/mc-sys.c | 5 +-
7 files changed, 73 insertions(+), 77 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/dprc-driver.c b/drivers/staging/fsl-mc/bus/dprc-driver.c
index d6a84dd..28a6b87 100644
--- a/drivers/staging/fsl-mc/bus/dprc-driver.c
+++ b/drivers/staging/fsl-mc/bus/dprc-driver.c
@@ -382,11 +382,11 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
dev_dbg(dev, "DPRC IRQ %d triggered on CPU %u\n",
irq_num, smp_processor_id());

- if (WARN_ON(!(mc_dev->flags & FSL_MC_IS_DPRC)))
+ if (!(mc_dev->flags & FSL_MC_IS_DPRC))
return IRQ_HANDLED;

mutex_lock(&mc_bus->scan_mutex);
- if (WARN_ON(!msi_desc || msi_desc->irq != (u32)irq_num))
+ if (!msi_desc || msi_desc->irq != (u32)irq_num)
goto out;

status = 0;
@@ -593,20 +593,20 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)
bool msi_domain_set = false;
u16 major_ver, minor_ver;

- if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ if (strcmp(mc_dev->obj_desc.type, "dprc") != 0)
return -EINVAL;

- if (WARN_ON(dev_get_msi_domain(&mc_dev->dev)))
+ if (dev_get_msi_domain(&mc_dev->dev))
return -EINVAL;

if (!mc_dev->mc_io) {
/*
* This is a child DPRC:
*/
- if (WARN_ON(!dev_is_fsl_mc(parent_dev)))
+ if (!dev_is_fsl_mc(parent_dev))
return -EINVAL;

- if (WARN_ON(mc_dev->obj_desc.region_count == 0))
+ if (mc_dev->obj_desc.region_count == 0)
return -EINVAL;

region_size = resource_size(mc_dev->regions);
@@ -634,7 +634,7 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)
*/
struct irq_domain *mc_msi_domain;

- if (WARN_ON(dev_is_fsl_mc(parent_dev)))
+ if (dev_is_fsl_mc(parent_dev))
return -EINVAL;

error = fsl_mc_find_msi_domain(parent_dev,
@@ -745,12 +745,12 @@ static int dprc_remove(struct fsl_mc_device *mc_dev)
int error;
struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);

- if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ if (strcmp(mc_dev->obj_desc.type, "dprc") != 0)
return -EINVAL;
- if (WARN_ON(!mc_dev->mc_io))
+ if (!mc_dev->mc_io)
return -EINVAL;

- if (WARN_ON(!mc_bus->irq_resources))
+ if (!mc_bus->irq_resources)
return -EINVAL;

if (dev_get_msi_domain(&mc_dev->dev))
diff --git a/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c b/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
index d472a85..f7fbebd 100644
--- a/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
+++ b/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
@@ -41,25 +41,25 @@ static int __must_check fsl_mc_resource_pool_add_device(struct fsl_mc_bus
struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
int error = -EINVAL;

- if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
+ if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES)
goto out;
- if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+ if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
goto out;
- if (WARN_ON(mc_dev->resource))
+ if (mc_dev->resource)
goto out;

res_pool = &mc_bus->resource_pools[pool_type];
- if (WARN_ON(res_pool->type != pool_type))
+ if (res_pool->type != pool_type)
goto out;
- if (WARN_ON(res_pool->mc_bus != mc_bus))
+ if (res_pool->mc_bus != mc_bus)
goto out;

mutex_lock(&res_pool->mutex);

- if (WARN_ON(res_pool->max_count < 0))
+ if (res_pool->max_count < 0)
goto out_unlock;
- if (WARN_ON(res_pool->free_count < 0 ||
- res_pool->free_count > res_pool->max_count))
+ if (res_pool->free_count < 0 ||
+ res_pool->free_count > res_pool->max_count)
goto out_unlock;

resource = devm_kzalloc(&mc_bus_dev->dev, sizeof(*resource),
@@ -105,25 +105,25 @@ static int __must_check fsl_mc_resource_pool_remove_device(struct fsl_mc_device
struct fsl_mc_resource *resource;
int error = -EINVAL;

- if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+ if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
goto out;

resource = mc_dev->resource;
- if (WARN_ON(!resource || resource->data != mc_dev))
+ if (!resource || resource->data != mc_dev)
goto out;

mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
mc_bus = to_fsl_mc_bus(mc_bus_dev);
res_pool = resource->parent_pool;
- if (WARN_ON(res_pool != &mc_bus->resource_pools[resource->type]))
+ if (res_pool != &mc_bus->resource_pools[resource->type])
goto out;

mutex_lock(&res_pool->mutex);

- if (WARN_ON(res_pool->max_count <= 0))
+ if (res_pool->max_count <= 0)
goto out_unlock;
- if (WARN_ON(res_pool->free_count <= 0 ||
- res_pool->free_count > res_pool->max_count))
+ if (res_pool->free_count <= 0 ||
+ res_pool->free_count > res_pool->max_count)
goto out_unlock;

/*
@@ -187,11 +187,11 @@ int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus,
FSL_MC_NUM_POOL_TYPES);

*new_resource = NULL;
- if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
+ if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES)
goto out;

res_pool = &mc_bus->resource_pools[pool_type];
- if (WARN_ON(res_pool->mc_bus != mc_bus))
+ if (res_pool->mc_bus != mc_bus)
goto out;

mutex_lock(&res_pool->mutex);
@@ -206,12 +206,12 @@ int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus,
goto out_unlock;
}

- if (WARN_ON(resource->type != pool_type))
+ if (resource->type != pool_type)
goto out_unlock;
- if (WARN_ON(resource->parent_pool != res_pool))
+ if (resource->parent_pool != res_pool)
goto out_unlock;
- if (WARN_ON(res_pool->free_count <= 0 ||
- res_pool->free_count > res_pool->max_count))
+ if (res_pool->free_count <= 0 ||
+ res_pool->free_count > res_pool->max_count)
goto out_unlock;

list_del_init(&resource->node);
@@ -231,15 +231,15 @@ void fsl_mc_resource_free(struct fsl_mc_resource *resource)
struct fsl_mc_resource_pool *res_pool;

res_pool = resource->parent_pool;
- if (WARN_ON(resource->type != res_pool->type))
+ if (resource->type != res_pool->type)
return;

mutex_lock(&res_pool->mutex);
- if (WARN_ON(res_pool->free_count < 0 ||
- res_pool->free_count >= res_pool->max_count))
+ if (res_pool->free_count < 0 ||
+ res_pool->free_count >= res_pool->max_count)
goto out_unlock;

- if (WARN_ON(!list_empty(&resource->node)))
+ if (!list_empty(&resource->node))
goto out_unlock;

list_add_tail(&resource->node, &res_pool->free_list);
@@ -278,13 +278,13 @@ int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
struct fsl_mc_resource *resource = NULL;

*new_mc_adev = NULL;
- if (WARN_ON(mc_dev->flags & FSL_MC_IS_DPRC))
+ if (mc_dev->flags & FSL_MC_IS_DPRC)
goto error;

- if (WARN_ON(!dev_is_fsl_mc(mc_dev->dev.parent)))
+ if (!dev_is_fsl_mc(mc_dev->dev.parent))
goto error;

- if (WARN_ON(pool_type == FSL_MC_POOL_DPMCP))
+ if (pool_type == FSL_MC_POOL_DPMCP)
goto error;

mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
@@ -294,7 +294,7 @@ int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
goto error;

mc_adev = resource->data;
- if (WARN_ON(!mc_adev))
+ if (!mc_adev)
goto error;

*new_mc_adev = mc_adev;
@@ -317,9 +317,9 @@ void fsl_mc_object_free(struct fsl_mc_device *mc_adev)
struct fsl_mc_resource *resource;

resource = mc_adev->resource;
- if (WARN_ON(resource->type == FSL_MC_POOL_DPMCP))
+ if (resource->type == FSL_MC_POOL_DPMCP)
return;
- if (WARN_ON(resource->data != mc_adev))
+ if (resource->data != mc_adev)
return;

fsl_mc_resource_free(resource);
@@ -348,8 +348,8 @@ int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
struct fsl_mc_resource_pool *res_pool =
&mc_bus->resource_pools[FSL_MC_POOL_IRQ];

- if (WARN_ON(irq_count == 0 ||
- irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS))
+ if (irq_count == 0 ||
+ irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS)
return -EINVAL;

error = fsl_mc_msi_domain_alloc_irqs(&mc_bus_dev->dev, irq_count);
@@ -405,13 +405,13 @@ void fsl_mc_cleanup_irq_pool(struct fsl_mc_bus *mc_bus)
struct fsl_mc_resource_pool *res_pool =
&mc_bus->resource_pools[FSL_MC_POOL_IRQ];

- if (WARN_ON(!mc_bus->irq_resources))
+ if (!mc_bus->irq_resources)
return;

- if (WARN_ON(res_pool->max_count == 0))
+ if (res_pool->max_count == 0)
return;

- if (WARN_ON(res_pool->free_count != res_pool->max_count))
+ if (res_pool->free_count != res_pool->max_count)
return;

INIT_LIST_HEAD(&res_pool->free_list);
@@ -435,11 +435,11 @@ int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev)
struct fsl_mc_bus *mc_bus;
struct fsl_mc_resource_pool *res_pool;

- if (WARN_ON(mc_dev->irqs))
+ if (mc_dev->irqs)
return -EINVAL;

irq_count = mc_dev->obj_desc.irq_count;
- if (WARN_ON(irq_count == 0))
+ if (irq_count == 0)
return -EINVAL;

if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
@@ -447,7 +447,7 @@ int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev)
else
mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent));

- if (WARN_ON(!mc_bus->irq_resources))
+ if (!mc_bus->irq_resources)
return -EINVAL;

res_pool = &mc_bus->resource_pools[FSL_MC_POOL_IRQ];
@@ -500,7 +500,7 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev)
struct fsl_mc_bus *mc_bus;
struct fsl_mc_device_irq **irqs = mc_dev->irqs;

- if (WARN_ON(!irqs))
+ if (!irqs)
return;

irq_count = mc_dev->obj_desc.irq_count;
@@ -510,7 +510,7 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev)
else
mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent));

- if (WARN_ON(!mc_bus->irq_resources))
+ if (!mc_bus->irq_resources)
return;

for (i = 0; i < irq_count; i++) {
@@ -575,11 +575,11 @@ static int fsl_mc_allocator_probe(struct fsl_mc_device *mc_dev)
struct fsl_mc_bus *mc_bus;
int error;

- if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+ if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
return -EINVAL;

mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
- if (WARN_ON(!dev_is_fsl_mc(&mc_bus_dev->dev)))
+ if (!dev_is_fsl_mc(&mc_bus_dev->dev))
return -EINVAL;

mc_bus = to_fsl_mc_bus(mc_bus_dev);
@@ -604,7 +604,7 @@ static int fsl_mc_allocator_remove(struct fsl_mc_device *mc_dev)
{
int error;

- if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+ if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
return -EINVAL;

if (mc_dev->resource) {
diff --git a/drivers/staging/fsl-mc/bus/fsl-mc-bus.c b/drivers/staging/fsl-mc/bus/fsl-mc-bus.c
index 1c2fd8d..854bd80 100644
--- a/drivers/staging/fsl-mc/bus/fsl-mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/fsl-mc-bus.c
@@ -284,9 +284,9 @@ static int mc_get_version(struct fsl_mc_io *mc_io,
static void fsl_mc_get_root_dprc(struct device *dev,
struct device **root_dprc_dev)
{
- if (WARN_ON(!dev)) {
+ if (!dev) {
*root_dprc_dev = NULL;
- } else if (WARN_ON(!dev_is_fsl_mc(dev))) {
+ } else if (!dev_is_fsl_mc(dev)) {
*root_dprc_dev = NULL;
} else {
*root_dprc_dev = dev;
@@ -532,7 +532,7 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
/*
* device being added is the root DPRC device
*/
- if (WARN_ON(!mc_io)) {
+ if (!mc_io) {
error = -EINVAL;
goto error_cleanup_dev;
}
@@ -814,7 +814,7 @@ static int fsl_mc_bus_remove(struct platform_device *pdev)
{
struct fsl_mc *mc = platform_get_drvdata(pdev);

- if (WARN_ON(!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev)))
+ if (!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev))
return -EINVAL;

fsl_mc_device_remove(mc->root_mc_bus_dev);
diff --git a/drivers/staging/fsl-mc/bus/fsl-mc-msi.c b/drivers/staging/fsl-mc/bus/fsl-mc-msi.c
index 0ce6117..625ba07 100644
--- a/drivers/staging/fsl-mc/bus/fsl-mc-msi.c
+++ b/drivers/staging/fsl-mc/bus/fsl-mc-msi.c
@@ -47,7 +47,7 @@ static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)
{
struct msi_domain_ops *ops = info->ops;

- if (WARN_ON(!ops))
+ if (!ops)
return;

/*
@@ -73,7 +73,7 @@ static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev,
if (msi_desc->msg.address_lo == 0x0 && msi_desc->msg.address_hi == 0x0)
return;

- if (WARN_ON(!owner_mc_dev))
+ if (!owner_mc_dev)
return;

irq_cfg.paddr = ((u64)msi_desc->msg.address_hi << 32) |
@@ -136,7 +136,7 @@ static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
{
struct irq_chip *chip = info->chip;

- if (WARN_ON(!chip))
+ if (!chip)
return;

/*
@@ -238,7 +238,7 @@ int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
struct irq_domain *msi_domain;
int error;

- if (WARN_ON(!list_empty(dev_to_msi_list(dev))))
+ if (!list_empty(dev_to_msi_list(dev)))
return -EINVAL;

error = fsl_mc_msi_alloc_descs(dev, irq_count);
@@ -246,7 +246,7 @@ int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
return error;

msi_domain = dev_get_msi_domain(dev);
- if (WARN_ON(!msi_domain)) {
+ if (!msi_domain) {
error = -EINVAL;
goto cleanup_msi_descs;
}
@@ -274,12 +274,12 @@ void fsl_mc_msi_domain_free_irqs(struct device *dev)
struct irq_domain *msi_domain;

msi_domain = dev_get_msi_domain(dev);
- if (WARN_ON(!msi_domain))
+ if (!msi_domain)
return;

msi_domain_free_irqs(msi_domain, dev);

- if (WARN_ON(list_empty(dev_to_msi_list(dev))))
+ if (list_empty(dev_to_msi_list(dev)))
return;

fsl_mc_msi_free_descs(dev);
diff --git a/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c b/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
index 947378f..6d81ac0 100644
--- a/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
+++ b/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
@@ -32,11 +32,11 @@ static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
struct fsl_mc_device *mc_bus_dev;
struct msi_domain_info *msi_info;

- if (WARN_ON(!dev_is_fsl_mc(dev)))
+ if (!dev_is_fsl_mc(dev))
return -EINVAL;

mc_bus_dev = to_fsl_mc_device(dev);
- if (WARN_ON(!(mc_bus_dev->flags & FSL_MC_IS_DPRC)))
+ if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
return -EINVAL;

/*
diff --git a/drivers/staging/fsl-mc/bus/mc-io.c b/drivers/staging/fsl-mc/bus/mc-io.c
index 5530856..3cbf92d 100644
--- a/drivers/staging/fsl-mc/bus/mc-io.c
+++ b/drivers/staging/fsl-mc/bus/mc-io.c
@@ -42,13 +42,10 @@ static int fsl_mc_io_set_dpmcp(struct fsl_mc_io *mc_io,
{
int error;

- if (WARN_ON(!dpmcp_dev))
+ if (mc_io->dpmcp_dev)
return -EINVAL;

- if (WARN_ON(mc_io->dpmcp_dev))
- return -EINVAL;
-
- if (WARN_ON(dpmcp_dev->mc_io))
+ if (dpmcp_dev->mc_io)
return -EINVAL;

error = dpmcp_open(mc_io,
@@ -204,7 +201,7 @@ int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
if (mc_dev->flags & FSL_MC_IS_DPRC) {
mc_bus_dev = mc_dev;
} else {
- if (WARN_ON(!dev_is_fsl_mc(mc_dev->dev.parent)))
+ if (!dev_is_fsl_mc(mc_dev->dev.parent))
return error;

mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
@@ -267,10 +264,10 @@ void fsl_mc_portal_free(struct fsl_mc_io *mc_io)
dpmcp_dev = mc_io->dpmcp_dev;

resource = dpmcp_dev->resource;
- if (WARN_ON(!resource || resource->type != FSL_MC_POOL_DPMCP))
+ if (!resource || resource->type != FSL_MC_POOL_DPMCP)
return;

- if (WARN_ON(resource->data != dpmcp_dev))
+ if (resource->data != dpmcp_dev)
return;

fsl_destroy_mc_io(mc_io);
diff --git a/drivers/staging/fsl-mc/bus/mc-sys.c b/drivers/staging/fsl-mc/bus/mc-sys.c
index a2854e5..db3636d 100644
--- a/drivers/staging/fsl-mc/bus/mc-sys.c
+++ b/drivers/staging/fsl-mc/bus/mc-sys.c
@@ -85,7 +85,7 @@ static int mc_status_to_error(enum mc_cmd_status status)
[MC_CMD_STATUS_INVALID_STATE] = -ENODEV,
};

- if (WARN_ON((u32)status >= ARRAY_SIZE(mc_status_to_error_map)))
+ if ((u32)status >= ARRAY_SIZE(mc_status_to_error_map))
return -EINVAL;

return mc_status_to_error_map[status];
@@ -273,8 +273,7 @@ int mc_send_command(struct fsl_mc_io *mc_io, struct mc_command *cmd)
enum mc_cmd_status status;
unsigned long irq_flags = 0;

- if (WARN_ON(in_irq() &&
- !(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)))
+ if (in_irq() && !(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL))
return -EINVAL;

if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
--
2.9.4

Next message: Yixun Lan: "Re: [PATCH 1/5] dt-bindings: i2c: update documentation for the Meson-AXG"
Previous message: Johan Hovold: "[PATCH v2] PCI: keystone: fix interrupt-controller-node lookup"
In reply to: laurentiu.tudor: "[PATCH 10/10] staging: fsl-mc: use device_type instead of strcmp()"
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