From: Andrzej Pietrasiewicz Date: Wed, 9 Oct 2013 08:05:53 +0000 (+0200) Subject: usb: gadget: f_mass_storage: make sysfs interface optional X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bd528d4e699b212a763eecda9cacffb4b85a5fe6;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git usb: gadget: f_mass_storage: make sysfs interface optional When configfs is in place, the luns will not be represented in sysfs, so there will be no struct device associated with a lun. In order to maintain compatibility and allow configfs adoption sysfs is made optional in this patch. As a consequence some debug macros need to be adjusted. Two new fields are added to struct fsg_lun: name and name_pfx. The "name" is for storing a string which is presented to the user instead of the dev_name. The "name_pfx", if non-NULL, is prepended to the "name" at printing time. The name_pfx is for a future lun.0, which will be a default group in mass_storage.. By design at USB function configfs group's creation time its name is not known (but instead set a bit later in drivers/usb/gadget/configfs.c:function_make) and it is this name that serves the purpose of the said name prefix. So instead of copying a yet-unknown string a pointer to it is stored in struct fsg_lun. Signed-off-by: Andrzej Pietrasiewicz Signed-off-by: Kyungmin Park Acked-by: Michal Nazarewicz Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c index 59a12c168cc5..7034d9c8363f 100644 --- a/drivers/usb/gadget/f_mass_storage.c +++ b/drivers/usb/gadget/f_mass_storage.c @@ -299,6 +299,7 @@ struct fsg_common { unsigned int short_packet_received:1; unsigned int bad_lun_okay:1; unsigned int running:1; + unsigned int sysfs:1; int thread_wakeup_needed; struct completion thread_notifier; @@ -2642,6 +2643,11 @@ static inline int fsg_num_buffers_validate(unsigned int fsg_num_buffers) return -EINVAL; } +void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs) +{ + common->sysfs = sysfs; +} + static void _fsg_common_free_buffers(struct fsg_buffhd *buffhds, unsigned n) { if (buffhds) { @@ -2654,6 +2660,34 @@ static void _fsg_common_free_buffers(struct fsg_buffhd *buffhds, unsigned n) } } +static inline void fsg_common_remove_sysfs(struct fsg_lun *lun) +{ + device_remove_file(&lun->dev, &dev_attr_nofua); + /* + * device_remove_file() => + * + * here the attr (e.g. dev_attr_ro) is only used to be passed to: + * + * sysfs_remove_file() => + * + * here e.g. both dev_attr_ro_cdrom and dev_attr_ro are in + * the same namespace and + * from here only attr->name is passed to: + * + * sysfs_hash_and_remove() + * + * attr->name is the same for dev_attr_ro_cdrom and + * dev_attr_ro + * attr->name is the same for dev_attr_file and + * dev_attr_file_nonremovable + * + * so we don't differentiate between removing e.g. dev_attr_ro_cdrom + * and dev_attr_ro + */ + device_remove_file(&lun->dev, &dev_attr_ro); + device_remove_file(&lun->dev, &dev_attr_file); +} + struct fsg_common *fsg_common_init(struct fsg_common *common, struct usb_composite_dev *cdev, struct fsg_config *cfg) @@ -2687,6 +2721,8 @@ struct fsg_common *fsg_common_init(struct fsg_common *common, memset(common, 0, sizeof *common); common->free_storage_on_release = 0; } + fsg_common_set_sysfs(common, true); + common->state = FSG_STATE_IDLE; common->fsg_num_buffers = cfg->fsg_num_buffers; common->buffhds = kcalloc(common->fsg_num_buffers, @@ -2746,6 +2782,7 @@ struct fsg_common *fsg_common_init(struct fsg_common *common, /* curlun->dev.driver = &fsg_driver.driver; XXX */ dev_set_drvdata(&curlun->dev, &common->filesem); dev_set_name(&curlun->dev, "lun%d", i); + curlun->name = dev_name(&curlun->dev); rc = device_register(&curlun->dev); if (rc) { @@ -2892,17 +2929,11 @@ static void fsg_common_release(struct kref *ref) struct fsg_lun *lun = *lun_it; if (!lun) continue; - device_remove_file(&lun->dev, &dev_attr_nofua); - device_remove_file(&lun->dev, - lun->cdrom - ? &dev_attr_ro_cdrom - : &dev_attr_ro); - device_remove_file(&lun->dev, - lun->removable - ? &dev_attr_file - : &dev_attr_file_nonremovable); + if (common->sysfs) + fsg_common_remove_sysfs(lun); fsg_lun_close(lun); - device_unregister(&lun->dev); + if (common->sysfs) + device_unregister(&lun->dev); kfree(lun); } diff --git a/drivers/usb/gadget/f_mass_storage.h b/drivers/usb/gadget/f_mass_storage.h index b64761d836f6..1b88eae75283 100644 --- a/drivers/usb/gadget/f_mass_storage.h +++ b/drivers/usb/gadget/f_mass_storage.h @@ -102,6 +102,8 @@ struct fsg_common *fsg_common_init(struct fsg_common *common, struct usb_composite_dev *cdev, struct fsg_config *cfg); +void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs); + void fsg_config_from_params(struct fsg_config *cfg, const struct fsg_module_parameters *params, unsigned int fsg_num_buffers); diff --git a/drivers/usb/gadget/storage_common.h b/drivers/usb/gadget/storage_common.h index 1fcda2bfef6c..d8cc090aca35 100644 --- a/drivers/usb/gadget/storage_common.h +++ b/drivers/usb/gadget/storage_common.h @@ -17,10 +17,20 @@ #define VLDBG(lun, fmt, args...) do { } while (0) #endif /* VERBOSE_DEBUG */ -#define LDBG(lun, fmt, args...) dev_dbg(&(lun)->dev, fmt, ## args) -#define LERROR(lun, fmt, args...) dev_err(&(lun)->dev, fmt, ## args) -#define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args) -#define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args) +#define _LMSG(func, lun, fmt, args...) \ + do { \ + if ((lun)->name_pfx && *(lun)->name_pfx) \ + func("%s/%s: " fmt, *(lun)->name_pfx, \ + (lun)->name, ## args); \ + else \ + func("%s: " fmt, (lun)->name, ## args); \ + } while (0) + +#define LDBG(lun, fmt, args...) _LMSG(pr_debug, lun, fmt, ## args) +#define LERROR(lun, fmt, args...) _LMSG(pr_err, lun, fmt, ## args) +#define LWARN(lun, fmt, args...) _LMSG(pr_warn, lun, fmt, ## args) +#define LINFO(lun, fmt, args...) _LMSG(pr_info, lun, fmt, ## args) + #ifdef DUMP_MSGS @@ -100,6 +110,8 @@ struct fsg_lun { of bound block device */ unsigned int blksize; /* logical block size of bound block device */ struct device dev; + const char *name; /* "lun.name" */ + const char **name_pfx; /* "function.name" */ }; static inline bool fsg_lun_is_open(struct fsg_lun *curlun)