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path: root/drivers/base/power/trace.c
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Diffstat (limited to 'drivers/base/power/trace.c')
-rw-r--r--drivers/base/power/trace.c36
1 files changed, 35 insertions, 1 deletions
diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c
index 0a1a2c4dbc6..9f4258df4cf 100644
--- a/drivers/base/power/trace.c
+++ b/drivers/base/power/trace.c
@@ -188,8 +188,10 @@ static int show_file_hash(unsigned int value)
static int show_dev_hash(unsigned int value)
{
int match = 0;
- struct list_head *entry = dpm_list.prev;
+ struct list_head *entry;
+ device_pm_lock();
+ entry = dpm_list.prev;
while (entry != &dpm_list) {
struct device * dev = to_device(entry);
unsigned int hash = hash_string(DEVSEED, dev_name(dev), DEVHASH);
@@ -199,11 +201,43 @@ static int show_dev_hash(unsigned int value)
}
entry = entry->prev;
}
+ device_pm_unlock();
return match;
}
static unsigned int hash_value_early_read;
+int show_trace_dev_match(char *buf, size_t size)
+{
+ unsigned int value = hash_value_early_read / (USERHASH * FILEHASH);
+ int ret = 0;
+ struct list_head *entry;
+
+ /*
+ * It's possible that multiple devices will match the hash and we can't
+ * tell which is the culprit, so it's best to output them all.
+ */
+ device_pm_lock();
+ entry = dpm_list.prev;
+ while (size && entry != &dpm_list) {
+ struct device *dev = to_device(entry);
+ unsigned int hash = hash_string(DEVSEED, dev_name(dev),
+ DEVHASH);
+ if (hash == value) {
+ int len = snprintf(buf, size, "%s\n",
+ dev_driver_string(dev));
+ if (len > size)
+ len = size;
+ buf += len;
+ ret += len;
+ size -= len;
+ }
+ entry = entry->prev;
+ }
+ device_pm_unlock();
+ return ret;
+}
+
static int early_resume_init(void)
{
hash_value_early_read = read_magic_time();