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Subject[PATCH 2/4] firmware: Make user-mode helper optional
Date
This patch adds a new kconfig, CONFIG_FW_LOADER_USER_HELPER, and
guards the user-helper codes in firmware_class.c with ifdefs.

Yeah, yeah, there are lots of ifdefs in this patch. The further
clean-up with code shuffling follows in the next.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
drivers/base/Kconfig | 11 ++++++++
drivers/base/firmware_class.c | 62 ++++++++++++++++++++++++++++++++++---------
2 files changed, 60 insertions(+), 13 deletions(-)

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index c8b4539..07abd9d 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -145,6 +145,17 @@ config EXTRA_FIRMWARE_DIR
this option you can point it elsewhere, such as /lib/firmware/ or
some other directory containing the firmware files.

+config FW_LOADER_USER_HELPER
+ bool "Fallback user-helper invocation for firmware loading"
+ depends on FW_LOADER
+ default y
+ help
+ This option enables / disables the invocation of user-helper
+ (e.g. udev) for loading firmware files as a fallback after the
+ direct file loading in kernel fails. The user-mode helper is
+ no longer required unless you have a special firmware file that
+ resides in a non-standard path.
+
config DEBUG_DRIVER
bool "Driver Core verbose debug messages"
depends on DEBUG_KERNEL
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 7da18e3..748bda1 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -88,6 +88,7 @@ enum {
FW_STATUS_ABORT,
};

+#ifdef CONFIG_FW_LOADER_USER_HELPER
enum fw_buf_fmt {
VMALLOC_BUF, /* used in direct loading */
PAGE_BUF, /* used in loading via userspace */
@@ -99,6 +100,7 @@ static inline long firmware_loading_timeout(void)
{
return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT;
}
+#endif /* CONFIG_FW_LOADER_USER_HELPER */

struct firmware_cache {
/* firmware_buf instance will be added into the below list */
@@ -128,12 +130,14 @@ struct firmware_buf {
struct completion completion;
struct firmware_cache *fwc;
unsigned long status;
- enum fw_buf_fmt fmt;
void *data;
size_t size;
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+ enum fw_buf_fmt fmt;
struct page **pages;
int nr_pages;
int page_array_size;
+#endif
char fw_id[];
};

@@ -142,6 +146,7 @@ struct fw_cache_entry {
char name[];
};

+#ifdef CONFIG_FW_LOADER_USER_HELPER
struct firmware_priv {
struct delayed_work timeout_work;
bool nowait;
@@ -149,6 +154,7 @@ struct firmware_priv {
struct firmware_buf *buf;
struct firmware *fw;
};
+#endif

struct fw_name_devm {
unsigned long magic;
@@ -182,7 +188,9 @@ static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
strcpy(buf->fw_id, fw_name);
buf->fwc = fwc;
init_completion(&buf->completion);
+#ifdef CONFIG_FW_LOADER_USER_HELPER
buf->fmt = VMALLOC_BUF;
+#endif

pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf);

@@ -240,7 +248,6 @@ static void __fw_free_buf(struct kref *ref)
{
struct firmware_buf *buf = to_fwbuf(ref);
struct firmware_cache *fwc = buf->fwc;
- int i;

pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
__func__, buf->fw_id, buf, buf->data,
@@ -250,12 +257,15 @@ static void __fw_free_buf(struct kref *ref)
spin_unlock(&fwc->lock);


+#ifdef CONFIG_FW_LOADER_USER_HELPER
if (buf->fmt == PAGE_BUF) {
+ int i;
vunmap(buf->data);
for (i = 0; i < buf->nr_pages; i++)
__free_page(buf->pages[i]);
kfree(buf->pages);
} else
+#endif
vfree(buf->data);
kfree(buf);
}
@@ -357,6 +367,19 @@ static bool fw_get_filesystem_firmware(struct device *device,
return success;
}

+/* firmware holds the ownership of pages */
+static void firmware_free_data(const struct firmware *fw)
+{
+ /* Loaded directly? */
+ if (!fw->priv) {
+ vfree(fw->data);
+ return;
+ }
+ fw_free_buf(fw->priv);
+}
+
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+
static struct firmware_priv *to_firmware_priv(struct device *dev)
{
return container_of(dev, struct firmware_priv, dev);
@@ -446,17 +469,6 @@ static ssize_t firmware_loading_show(struct device *dev,
return sprintf(buf, "%d\n", loading);
}

-/* firmware holds the ownership of pages */
-static void firmware_free_data(const struct firmware *fw)
-{
- /* Loaded directly? */
- if (!fw->priv) {
- vfree(fw->data);
- return;
- }
- fw_free_buf(fw->priv);
-}
-
/* Some architectures don't have PAGE_KERNEL_RO */
#ifndef PAGE_KERNEL_RO
#define PAGE_KERNEL_RO PAGE_KERNEL
@@ -737,12 +749,15 @@ fw_create_instance(struct firmware *firmware, const char *fw_name,
exit:
return fw_priv;
}
+#endif /* CONFIG_FW_LOADER_USER_HELPER */

/* store the pages buffer info firmware from buf */
static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw)
{
fw->priv = buf;
+#ifdef CONFIG_FW_LOADER_USER_HELPER
fw->pages = buf->pages;
+#endif
fw->size = buf->size;
fw->data = buf->data;

@@ -916,6 +931,7 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device)
return 0;
}

+#ifdef CONFIG_FW_LOADER_USER_HELPER
/* load a firmware via user helper */
static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
long timeout)
@@ -1015,6 +1031,14 @@ static int fw_load_from_user_helper(struct firmware *firmware,
usermodehelper_read_unlock();
return ret;
}
+#else /* CONFIG_FW_LOADER_USER_HELPER */
+static inline int
+fw_load_from_user_helper(struct firmware *firmware, const char *name,
+ struct device *device, bool uevent, bool nowait)
+{
+ return -ENOENT;
+}
+#endif /* CONFIG_FW_LOADER_USER_HELPER */

/* called from request_firmware() and request_firmware_work_func() */
static int
@@ -1379,7 +1403,9 @@ static void __device_uncache_fw_images(void)
static void device_cache_fw_images(void)
{
struct firmware_cache *fwc = &fw_cache;
+#ifdef CONFIG_FW_LOADER_USER_HELPER
int old_timeout;
+#endif
DEFINE_WAIT(wait);

pr_debug("%s\n", __func__);
@@ -1387,6 +1413,7 @@ static void device_cache_fw_images(void)
/* cancel uncache work */
cancel_delayed_work_sync(&fwc->work);

+#ifdef CONFIG_FW_LOADER_USER_HELPER
/*
* use small loading timeout for caching devices' firmware
* because all these firmware images have been loaded
@@ -1397,6 +1424,7 @@ static void device_cache_fw_images(void)
*/
old_timeout = loading_timeout;
loading_timeout = 10;
+#endif

mutex_lock(&fw_lock);
fwc->state = FW_LOADER_START_CACHE;
@@ -1406,7 +1434,9 @@ static void device_cache_fw_images(void)
/* wait for completion of caching firmware for all devices */
async_synchronize_full_domain(&fw_cache_domain);

+#ifdef CONFIG_FW_LOADER_USER_HELPER
loading_timeout = old_timeout;
+#endif
}

/**
@@ -1506,7 +1536,11 @@ static void __init fw_cache_init(void)
static int __init firmware_class_init(void)
{
fw_cache_init();
+#ifdef CONFIG_FW_LOADER_USER_HELPER
return class_register(&firmware_class);
+#else
+ return 0;
+#endif
}

static void __exit firmware_class_exit(void)
@@ -1515,7 +1549,9 @@ static void __exit firmware_class_exit(void)
unregister_syscore_ops(&fw_syscore_ops);
unregister_pm_notifier(&fw_cache.pm_notify);
#endif
+#ifdef CONFIG_FW_LOADER_USER_HELPER
class_unregister(&firmware_class);
+#endif
}

fs_initcall(firmware_class_init);
--
1.8.1.1


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