summaryrefslogtreecommitdiffstats
path: root/lib/dma-debug.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/dma-debug.c')
-rw-r--r--lib/dma-debug.c112
1 files changed, 56 insertions, 56 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 77053d9ef513..ad65fc0317d9 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -139,7 +139,7 @@ static inline void dump_entry_trace(struct dma_debug_entry *entry)
{
#ifdef CONFIG_STACKTRACE
if (entry) {
- printk(KERN_WARNING "Mapped at:\n");
+ pr_warning("Mapped at:\n");
print_stack_trace(&entry->stacktrace, 0);
}
#endif
@@ -147,6 +147,10 @@ static inline void dump_entry_trace(struct dma_debug_entry *entry)
static bool driver_filter(struct device *dev)
{
+ struct device_driver *drv;
+ unsigned long flags;
+ bool ret;
+
/* driver filter off */
if (likely(!current_driver_name[0]))
return true;
@@ -155,32 +159,28 @@ static bool driver_filter(struct device *dev)
if (current_driver && dev->driver == current_driver)
return true;
- /* driver filter on but not yet initialized */
- if (!current_driver && current_driver_name[0]) {
- struct device_driver *drv = get_driver(dev->driver);
- unsigned long flags;
- bool ret = false;
-
- if (!drv)
- return false;
-
- /* lock to protect against change of current_driver_name */
- read_lock_irqsave(&driver_name_lock, flags);
+ if (current_driver || !current_driver_name[0])
+ return false;
- if (drv->name &&
- strncmp(current_driver_name, drv->name,
- NAME_MAX_LEN-1) == 0) {
- current_driver = drv;
- ret = true;
- }
+ /* driver filter on but not yet initialized */
+ drv = get_driver(dev->driver);
+ if (!drv)
+ return false;
- read_unlock_irqrestore(&driver_name_lock, flags);
- put_driver(drv);
+ /* lock to protect against change of current_driver_name */
+ read_lock_irqsave(&driver_name_lock, flags);
- return ret;
+ ret = false;
+ if (drv->name &&
+ strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
+ current_driver = drv;
+ ret = true;
}
- return false;
+ read_unlock_irqrestore(&driver_name_lock, flags);
+ put_driver(drv);
+
+ return ret;
}
#define err_printk(dev, entry, format, arg...) do { \
@@ -377,8 +377,7 @@ static struct dma_debug_entry *dma_entry_alloc(void)
spin_lock_irqsave(&free_entries_lock, flags);
if (list_empty(&free_entries)) {
- printk(KERN_ERR "DMA-API: debugging out of memory "
- "- disabling\n");
+ pr_err("DMA-API: debugging out of memory - disabling\n");
global_disable = true;
goto out;
}
@@ -483,8 +482,7 @@ static int prealloc_memory(u32 num_entries)
num_free_entries = num_entries;
min_free_entries = num_entries;
- printk(KERN_INFO "DMA-API: preallocated %d debug entries\n",
- num_entries);
+ pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
return 0;
@@ -501,8 +499,8 @@ out_err:
static ssize_t filter_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
- unsigned long flags;
char buf[NAME_MAX_LEN + 1];
+ unsigned long flags;
int len;
if (!current_driver_name[0])
@@ -523,9 +521,9 @@ static ssize_t filter_read(struct file *file, char __user *user_buf,
static ssize_t filter_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
- unsigned long flags;
char buf[NAME_MAX_LEN];
- size_t len = NAME_MAX_LEN - 1;
+ unsigned long flags;
+ size_t len;
int i;
/*
@@ -534,7 +532,7 @@ static ssize_t filter_write(struct file *file, const char __user *userbuf,
* disabled. Since copy_from_user can fault and may sleep we
* need to copy to temporary buffer first
*/
- len = min(count, len);
+ len = min(count, (size_t)(NAME_MAX_LEN - 1));
if (copy_from_user(buf, userbuf, len))
return -EFAULT;
@@ -542,7 +540,8 @@ static ssize_t filter_write(struct file *file, const char __user *userbuf,
write_lock_irqsave(&driver_name_lock, flags);
- /* Now handle the string we got from userspace very carefully.
+ /*
+ * Now handle the string we got from userspace very carefully.
* The rules are:
* - only use the first token we got
* - token delimiter is everything looking like a space
@@ -551,13 +550,12 @@ static ssize_t filter_write(struct file *file, const char __user *userbuf,
*/
if (!isalnum(buf[0])) {
/*
- If the first character userspace gave us is not
+ * If the first character userspace gave us is not
* alphanumerical then assume the filter should be
* switched off.
*/
if (current_driver_name[0])
- printk(KERN_INFO "DMA-API: switching off dma-debug "
- "driver filter\n");
+ pr_info("DMA-API: switching off dma-debug driver filter\n");
current_driver_name[0] = 0;
current_driver = NULL;
goto out_unlock;
@@ -575,8 +573,8 @@ static ssize_t filter_write(struct file *file, const char __user *userbuf,
current_driver_name[i] = 0;
current_driver = NULL;
- printk(KERN_INFO "DMA-API: enable driver filter for driver [%s]\n",
- current_driver_name);
+ pr_info("DMA-API: enable driver filter for driver [%s]\n",
+ current_driver_name);
out_unlock:
write_unlock_irqrestore(&driver_name_lock, flags);
@@ -593,7 +591,7 @@ static int dma_debug_fs_init(void)
{
dma_debug_dent = debugfs_create_dir("dma-api", NULL);
if (!dma_debug_dent) {
- printk(KERN_ERR "DMA-API: can not create debugfs directory\n");
+ pr_err("DMA-API: can not create debugfs directory\n");
return -ENOMEM;
}
@@ -651,15 +649,19 @@ static int device_dma_allocations(struct device *dev)
unsigned long flags;
int count = 0, i;
+ local_irq_save(flags);
+
for (i = 0; i < HASH_SIZE; ++i) {
- spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
+ spin_lock(&dma_entry_hash[i].lock);
list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
if (entry->dev == dev)
count += 1;
}
- spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
+ spin_unlock(&dma_entry_hash[i].lock);
}
+ local_irq_restore(flags);
+
return count;
}
@@ -692,7 +694,7 @@ void dma_debug_add_bus(struct bus_type *bus)
nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
if (nb == NULL) {
- printk(KERN_ERR "dma_debug_add_bus: out of memory\n");
+ pr_err("dma_debug_add_bus: out of memory\n");
return;
}
@@ -717,8 +719,7 @@ void dma_debug_init(u32 num_entries)
}
if (dma_debug_fs_init() != 0) {
- printk(KERN_ERR "DMA-API: error creating debugfs entries "
- "- disabling\n");
+ pr_err("DMA-API: error creating debugfs entries - disabling\n");
global_disable = true;
return;
@@ -728,8 +729,7 @@ void dma_debug_init(u32 num_entries)
num_entries = req_entries;
if (prealloc_memory(num_entries) != 0) {
- printk(KERN_ERR "DMA-API: debugging out of memory error "
- "- disabled\n");
+ pr_err("DMA-API: debugging out of memory error - disabled\n");
global_disable = true;
return;
@@ -737,7 +737,7 @@ void dma_debug_init(u32 num_entries)
nr_total_entries = num_free_entries;
- printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n");
+ pr_info("DMA-API: debugging enabled by kernel config\n");
}
static __init int dma_debug_cmdline(char *str)
@@ -746,8 +746,7 @@ static __init int dma_debug_cmdline(char *str)
return -EINVAL;
if (strncmp(str, "off", 3) == 0) {
- printk(KERN_INFO "DMA-API: debugging disabled on kernel "
- "command line\n");
+ pr_info("DMA-API: debugging disabled on kernel command line\n");
global_disable = true;
}
@@ -1039,18 +1038,19 @@ EXPORT_SYMBOL(debug_dma_map_sg);
static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s)
{
- struct dma_debug_entry *entry;
+ struct dma_debug_entry *entry, ref;
struct hash_bucket *bucket;
unsigned long flags;
- int mapped_ents = 0;
- struct dma_debug_entry ref;
+ int mapped_ents;
- ref.dev = dev;
+ ref.dev = dev;
ref.dev_addr = sg_dma_address(s);
- ref.size = sg_dma_len(s),
+ ref.size = sg_dma_len(s),
+
+ bucket = get_hash_bucket(&ref, &flags);
+ entry = hash_bucket_find(bucket, &ref);
+ mapped_ents = 0;
- bucket = get_hash_bucket(&ref, &flags);
- entry = hash_bucket_find(bucket, &ref);
if (entry)
mapped_ents = entry->sg_mapped_ents;
put_hash_bucket(bucket, &flags);
@@ -1237,8 +1237,8 @@ static int __init dma_debug_driver_setup(char *str)
}
if (current_driver_name[0])
- printk(KERN_INFO "DMA-API: enable driver filter for "
- "driver [%s]\n", current_driver_name);
+ pr_info("DMA-API: enable driver filter for driver [%s]\n",
+ current_driver_name);
return 1;
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-07 23:06:37 +0100