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authorNeil Horman <nhorman@tuxdriver.com>2013-09-06 15:36:08 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-09-26 15:35:30 -0700
commit3e358ac2bb5bb9c9f4842145ca0da2384d13fd98 (patch)
tree2cce5ee4430e67107d5b82c6518a8a6c9ce21447 /drivers/base/firmware_class.c
parentcfec0bc835c84d3d3723d4955587f05a94879b26 (diff)
downloadlinux-3e358ac2bb5bb9c9f4842145ca0da2384d13fd98.tar.bz2
firmware: Be a bit more verbose about direct firmware loading failure
The direct firmware loading interface is a bit quiet about failures. Failures that occur during loading are masked if firmware exists in multiple locations, and may be masked entirely in the event that we fall back to the user mode helper code. It would be nice to see some of the more unexpected errors get logged, so in the event that you expect the direct firmware loader to work (like if CONFIG_FW_LOADER_USER_HELPER is enabled), and something goes wrong, you can figure out what happened. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/firmware_class.c')
-rw-r--r--drivers/base/firmware_class.c38
1 files changed, 25 insertions, 13 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 10a4467c63f1..eb8fb94ae2c5 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -282,31 +282,35 @@ static noinline_for_stack long fw_file_size(struct file *file)
return st.size;
}
-static bool fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf)
+static int fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf)
{
long size;
char *buf;
+ int rc;
size = fw_file_size(file);
if (size <= 0)
- return false;
+ return -EINVAL;
buf = vmalloc(size);
if (!buf)
- return false;
- if (kernel_read(file, 0, buf, size) != size) {
+ return -ENOMEM;
+ rc = kernel_read(file, 0, buf, size);
+ if (rc != size) {
+ if (rc > 0)
+ rc = -EIO;
vfree(buf);
- return false;
+ return rc;
}
fw_buf->data = buf;
fw_buf->size = size;
- return true;
+ return 0;
}
-static bool fw_get_filesystem_firmware(struct device *device,
+static int fw_get_filesystem_firmware(struct device *device,
struct firmware_buf *buf)
{
int i;
- bool success = false;
+ int rc = -ENOENT;
char *path = __getname();
for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
@@ -321,14 +325,17 @@ static bool fw_get_filesystem_firmware(struct device *device,
file = filp_open(path, O_RDONLY, 0);
if (IS_ERR(file))
continue;
- success = fw_read_file_contents(file, buf);
+ rc = fw_read_file_contents(file, buf);
fput(file);
- if (success)
+ if (rc)
+ dev_warn(device, "firmware, attempted to load %s, but failed with error %d\n",
+ path, rc);
+ else
break;
}
__putname(path);
- if (success) {
+ if (!rc) {
dev_dbg(device, "firmware: direct-loading firmware %s\n",
buf->fw_id);
mutex_lock(&fw_lock);
@@ -337,7 +344,7 @@ static bool fw_get_filesystem_firmware(struct device *device,
mutex_unlock(&fw_lock);
}
- return success;
+ return rc;
}
/* firmware holds the ownership of pages */
@@ -1086,9 +1093,14 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
}
}
- if (!fw_get_filesystem_firmware(device, fw->priv))
+ ret = fw_get_filesystem_firmware(device, fw->priv);
+ if (ret) {
+ dev_warn(device, "Direct firmware load failed with error %d\n",
+ ret);
+ dev_warn(device, "Falling back to user helper\n");
ret = fw_load_from_user_helper(fw, name, device,
uevent, nowait, timeout);
+ }
/* don't cache firmware handled without uevent */
if (!ret)