firmware_class: make request_firmware_nowait more useful

Unfortunately, one cannot hold on to the struct firmware
that request_firmware_nowait() hands off, which is needed
in some cases. Allow this by requiring the callback to
free it (via release_firmware).

Additionally, give it a gfp_t parameter -- all the current
users call it from a GFP_KERNEL context so the GFP_ATOMIC
isn't necessary. This also marks an API break which is
useful in a sense, although that is obviously not the
primary purpose of this change.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Cc: Pavel Roskin <proski@gnu.org>
Cc: Abhay Salunke <abhay_salunke@dell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 7376367..a950241 100644 (file)
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -601,12 +601,9 @@ request_firmware_work_func(void *arg)
        }
        ret = _request_firmware(&fw, fw_work->name, fw_work->device,
                fw_work->uevent);
-       if (ret < 0)
-               fw_work->cont(NULL, fw_work->context);
-       else {
-               fw_work->cont(fw, fw_work->context);
-               release_firmware(fw);
-       }
+
+       fw_work->cont(fw, fw_work->context);
+
        module_put(fw_work->module);
        kfree(fw_work);
        return ret;
@@ -619,6 +616,7 @@ request_firmware_work_func(void *arg)
  *     is non-zero else the firmware copy must be done manually.
  * @name: name of firmware file
  * @device: device for which firmware is being loaded
+ * @gfp: allocation flags
  * @context: will be passed over to @cont, and
  *     @fw may be %NULL if firmware request fails.
  * @cont: function will be called asynchronously when the firmware
@@ -631,12 +629,12 @@ request_firmware_work_func(void *arg)
 int
 request_firmware_nowait(
        struct module *module, int uevent,
-       const char *name, struct device *device, void *context,
+       const char *name, struct device *device, gfp_t gfp, void *context,
        void (*cont)(const struct firmware *fw, void *context))
 {
        struct task_struct *task;
        struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work),
-                                               GFP_ATOMIC);
+                                               gfp);
 
        if (!fw_work)
                return -ENOMEM;

diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c
index b4704e1..b3a0cf5 100644 (file)
--- a/drivers/firmware/dell_rbu.c
+++ b/drivers/firmware/dell_rbu.c
@@ -544,9 +544,12 @@ static void callbackfn_rbu(const struct firmware *fw, void *context)
 {
        rbu_data.entry_created = 0;
 
-       if (!fw || !fw->size)
+       if (!fw)
                return;
 
+       if (!fw->size)
+               goto out;
+
        spin_lock(&rbu_data.lock);
        if (!strcmp(image_type, "mono")) {
                if (!img_update_realloc(fw->size))
@@ -568,6 +571,8 @@ static void callbackfn_rbu(const struct firmware *fw, void *context)
        } else
                pr_debug("invalid image type specified.\n");
        spin_unlock(&rbu_data.lock);
+ out:
+       release_firmware(fw);
 }
 
 static ssize_t read_rbu_image_type(struct kobject *kobj,
@@ -615,7 +620,7 @@ static ssize_t write_rbu_image_type(struct kobject *kobj,
                        spin_unlock(&rbu_data.lock);
                        req_firm_rc = request_firmware_nowait(THIS_MODULE,
                                FW_ACTION_NOHOTPLUG, "dell_rbu",
-                               &rbu_device->dev, &context,
+                               &rbu_device->dev, GFP_KERNEL, &context,
                                callbackfn_rbu);
                        if (req_firm_rc) {
                                printk(KERN_ERR

diff --git a/drivers/serial/ucc_uart.c b/drivers/serial/ucc_uart.c
index 46de564..465f2fa 100644 (file)
--- a/drivers/serial/ucc_uart.c
+++ b/drivers/serial/ucc_uart.c
@@ -1179,16 +1179,18 @@ static void uart_firmware_cont(const struct firmware *fw, void *context)
 
        if (firmware->header.length != fw->size) {
                dev_err(dev, "invalid firmware\n");
-               return;
+               goto out;
        }
 
        ret = qe_upload_firmware(firmware);
        if (ret) {
                dev_err(dev, "could not load firmware\n");
-               return;
+               goto out;
        }
 
        firmware_loaded = 1;
+ out:
+       release_firmware(fw);
 }
 
 static int ucc_uart_probe(struct of_device *ofdev,
@@ -1247,7 +1249,7 @@ static int ucc_uart_probe(struct of_device *ofdev,
                         */
                        ret = request_firmware_nowait(THIS_MODULE,
                                FW_ACTION_HOTPLUG, filename, &ofdev->dev,
-                               &ofdev->dev, uart_firmware_cont);
+                               GFP_KERNEL, &ofdev->dev, uart_firmware_cont);
                        if (ret) {
                                dev_err(&ofdev->dev,
                                        "could not load firmware %s\n",

diff --git a/drivers/staging/comedi/drivers/usbdux.c b/drivers/staging/comedi/drivers/usbdux.c
index cca4e86..dfcd12b 100644 (file)
--- a/drivers/staging/comedi/drivers/usbdux.c
+++ b/drivers/staging/comedi/drivers/usbdux.c
@@ -2327,9 +2327,11 @@ static void usbdux_firmware_request_complete_handler(const struct firmware *fw,
        if (ret) {
                dev_err(&usbdev->dev,
                        "Could not upload firmware (err=%d)\n", ret);
-               return;
+               goto out;
        }
        comedi_usb_auto_config(usbdev, BOARDNAME);
+ out:
+       release_firmware(fw);
 }
 
 /* allocate memory for the urbs and initialise them */
@@ -2580,6 +2582,7 @@ static int usbduxsub_probe(struct usb_interface *uinterf,
                                      FW_ACTION_HOTPLUG,
                                      "usbdux_firmware.bin",
                                      &udev->dev,
+                                     GFP_KERNEL,
                                      usbduxsub + index,
                                      usbdux_firmware_request_complete_handler);
 

diff --git a/drivers/staging/comedi/drivers/usbduxfast.c b/drivers/staging/comedi/drivers/usbduxfast.c
index d143222..2e675cc 100644 (file)
--- a/drivers/staging/comedi/drivers/usbduxfast.c
+++ b/drivers/staging/comedi/drivers/usbduxfast.c
@@ -1451,10 +1451,12 @@ static void usbduxfast_firmware_request_complete_handler(const struct firmware
        if (ret) {
                dev_err(&usbdev->dev,
                        "Could not upload firmware (err=%d)\n", ret);
-               return;
+               goto out;
        }
 
        comedi_usb_auto_config(usbdev, BOARDNAME);
+ out:
+       release_firmware(fw);
 }
 
 /*
@@ -1569,6 +1571,7 @@ static int usbduxfastsub_probe(struct usb_interface *uinterf,
                                      FW_ACTION_HOTPLUG,
                                      "usbduxfast_firmware.bin",
                                      &udev->dev,
+                                     GFP_KERNEL,
                                      usbduxfastsub + index,
                                      usbduxfast_firmware_request_complete_handler);
 

diff --git a/drivers/usb/atm/ueagle-atm.c b/drivers/usb/atm/ueagle-atm.c
index bba4d3e..c539524 100644 (file)
--- a/drivers/usb/atm/ueagle-atm.c
+++ b/drivers/usb/atm/ueagle-atm.c
@@ -667,12 +667,12 @@ static void uea_upload_pre_firmware(const struct firmware *fw_entry, void *conte
        else
                uea_info(usb, "firmware uploaded\n");
 
-       uea_leaves(usb);
-       return;
+       goto err;
 
 err_fw_corrupted:
        uea_err(usb, "firmware is corrupted\n");
 err:
+       release_firmware(fw_entry);
        uea_leaves(usb);
 }
 
@@ -705,7 +705,8 @@ static int uea_load_firmware(struct usb_device *usb, unsigned int ver)
                break;
        }
 
-       ret = request_firmware_nowait(THIS_MODULE, 1, fw_name, &usb->dev, usb, uea_upload_pre_firmware);
+       ret = request_firmware_nowait(THIS_MODULE, 1, fw_name, &usb->dev,
+                                     GFP_KERNEL, usb, uea_upload_pre_firmware);
        if (ret)
                uea_err(usb, "firmware %s is not available\n", fw_name);
        else

diff --git a/include/linux/firmware.h b/include/linux/firmware.h
index d315446..043811f 100644 (file)
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -4,6 +4,7 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <linux/gfp.h>
 
 #define FW_ACTION_NOHOTPLUG 0
 #define FW_ACTION_HOTPLUG 1
@@ -38,7 +39,7 @@ int request_firmware(const struct firmware **fw, const char *name,
                     struct device *device);
 int request_firmware_nowait(
        struct module *module, int uevent,
-       const char *name, struct device *device, void *context,
+       const char *name, struct device *device, gfp_t gfp, void *context,
        void (*cont)(const struct firmware *fw, void *context));
 
 void release_firmware(const struct firmware *fw);
@@ -51,7 +52,7 @@ static inline int request_firmware(const struct firmware **fw,
 }
 static inline int request_firmware_nowait(
        struct module *module, int uevent,
-       const char *name, struct device *device, void *context,
+       const char *name, struct device *device, gfp_t gfp, void *context,
        void (*cont)(const struct firmware *fw, void *context))
 {
        return -EINVAL;