The kref used to be needed because sharing of fsg_common among multiple USB function instances was handled by fsg. Now this is managed by configfs, we don't need it anymore. So let's eliminate kref from this driver.
Signed-off-by: Jaejoong Kim <climbbb....@gmail.com> --- Changes in V2: - Rewrite commit title & message. - Remove kref instead of removing unused kref EXPORT_SYMBOL (Alan and Michal) V1 patches https://patchwork.kernel.org/patch/10463709/ https://patchwork.kernel.org/patch/10463713/ drivers/usb/gadget/function/f_mass_storage.c | 27 +++++---------------------- drivers/usb/gadget/function/f_mass_storage.h | 4 ---- 2 files changed, 5 insertions(+), 26 deletions(-) diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c index 1b580eb..ca8a4b5 100644 --- a/drivers/usb/gadget/function/f_mass_storage.c +++ b/drivers/usb/gadget/function/f_mass_storage.c @@ -206,7 +206,6 @@ #include <linux/fcntl.h> #include <linux/file.h> #include <linux/fs.h> -#include <linux/kref.h> #include <linux/kthread.h> #include <linux/sched/signal.h> #include <linux/limits.h> @@ -312,8 +311,6 @@ struct fsg_common { void *private_data; char inquiry_string[INQUIRY_STRING_LEN]; - - struct kref ref; }; struct fsg_dev { @@ -2551,25 +2548,11 @@ static DEVICE_ATTR(file, 0, file_show, file_store); /****************************** FSG COMMON ******************************/ -static void fsg_common_release(struct kref *ref); - static void fsg_lun_release(struct device *dev) { /* Nothing needs to be done */ } -void fsg_common_get(struct fsg_common *common) -{ - kref_get(&common->ref); -} -EXPORT_SYMBOL_GPL(fsg_common_get); - -void fsg_common_put(struct fsg_common *common) -{ - kref_put(&common->ref, fsg_common_release); -} -EXPORT_SYMBOL_GPL(fsg_common_put); - static struct fsg_common *fsg_common_setup(struct fsg_common *common) { if (!common) { @@ -2582,7 +2565,6 @@ static struct fsg_common *fsg_common_setup(struct fsg_common *common) } init_rwsem(&common->filesem); spin_lock_init(&common->lock); - kref_init(&common->ref); init_completion(&common->thread_notifier); init_waitqueue_head(&common->io_wait); init_waitqueue_head(&common->fsg_wait); @@ -2870,9 +2852,8 @@ void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn, } EXPORT_SYMBOL_GPL(fsg_common_set_inquiry_string); -static void fsg_common_release(struct kref *ref) +static void fsg_common_release(struct fsg_common *common) { - struct fsg_common *common = container_of(ref, struct fsg_common, ref); int i; /* If the thread isn't already dead, tell it to exit now */ @@ -3346,7 +3327,7 @@ static void fsg_free_inst(struct usb_function_instance *fi) struct fsg_opts *opts; opts = fsg_opts_from_func_inst(fi); - fsg_common_put(opts->common); + fsg_common_release(opts->common); kfree(opts); } @@ -3370,7 +3351,7 @@ static struct usb_function_instance *fsg_alloc_inst(void) rc = fsg_common_set_num_buffers(opts->common, CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS); if (rc) - goto release_opts; + goto release_common; pr_info(FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n"); @@ -3393,6 +3374,8 @@ static struct usb_function_instance *fsg_alloc_inst(void) release_buffers: fsg_common_free_buffers(opts->common); +release_common: + kfree(opts->common); release_opts: kfree(opts); return ERR_PTR(rc); diff --git a/drivers/usb/gadget/function/f_mass_storage.h b/drivers/usb/gadget/function/f_mass_storage.h index 58857fc..3b8c4ce 100644 --- a/drivers/usb/gadget/function/f_mass_storage.h +++ b/drivers/usb/gadget/function/f_mass_storage.h @@ -115,10 +115,6 @@ fsg_opts_from_func_inst(const struct usb_function_instance *fi) return container_of(fi, struct fsg_opts, func_inst); } -void fsg_common_get(struct fsg_common *common); - -void fsg_common_put(struct fsg_common *common); - void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs); int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n); -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
