From 70634170999a15e338b4091e06bd36ffdd283899 Mon Sep 17 00:00:00 2001 From: Andrzej Pietrasiewicz Date: Wed, 9 Oct 2013 10:05:56 +0200 Subject: [PATCH] usb: gadget: f_mass_storage: create lun handling helpers for use in fsg_common_init fsg_common_init is a lengthy function. Factor portions of it out. Signed-off-by: Andrzej Pietrasiewicz Signed-off-by: Kyungmin Park Acked-by: Michal Nazarewicz Signed-off-by: Felipe Balbi --- drivers/usb/gadget/f_mass_storage.c | 80 +++++++++++++++++++++++------ drivers/usb/gadget/f_mass_storage.h | 8 +++ 2 files changed, 71 insertions(+), 17 deletions(-) diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c index 79d989979360..cb789fa885fd 100644 --- a/drivers/usb/gadget/f_mass_storage.c +++ b/drivers/usb/gadget/f_mass_storage.c @@ -2752,6 +2752,64 @@ static inline void fsg_common_remove_sysfs(struct fsg_lun *lun) device_remove_file(&lun->dev, &dev_attr_file); } +void fsg_common_remove_lun(struct fsg_lun *lun, bool sysfs) +{ + if (sysfs) { + fsg_common_remove_sysfs(lun); + device_unregister(&lun->dev); + } + fsg_lun_close(lun); + kfree(lun); +} + +static void _fsg_common_remove_luns(struct fsg_common *common, int n) +{ + int i; + + for (i = 0; i < n; ++i) + if (common->luns[i]) { + fsg_common_remove_lun(common->luns[i], common->sysfs); + common->luns[i] = NULL; + } +} + +void fsg_common_remove_luns(struct fsg_common *common) +{ + _fsg_common_remove_luns(common, common->nluns); +} + +void fsg_common_free_luns(struct fsg_common *common) +{ + fsg_common_remove_luns(common); + kfree(common->luns); + common->luns = NULL; +} + +int fsg_common_set_nluns(struct fsg_common *common, int nluns) +{ + struct fsg_lun **curlun; + + /* Find out how many LUNs there should be */ + if (nluns < 1 || nluns > FSG_MAX_LUNS) { + pr_err("invalid number of LUNs: %u\n", nluns); + return -EINVAL; + } + + curlun = kcalloc(nluns, sizeof(*curlun), GFP_KERNEL); + if (unlikely(!curlun)) + return -ENOMEM; + + if (common->luns) + fsg_common_free_luns(common); + + common->luns = curlun; + common->nluns = nluns; + + pr_info("Number of LUNs=%d\n", common->nluns); + + return 0; +} + struct fsg_common *fsg_common_init(struct fsg_common *common, struct usb_composite_dev *cdev, struct fsg_config *cfg) @@ -2763,12 +2821,6 @@ struct fsg_common *fsg_common_init(struct fsg_common *common, int nluns, i, rc; char *pathbuf; - /* Find out how many LUNs there should be */ - nluns = cfg->nluns; - if (nluns < 1 || nluns > FSG_MAX_LUNS) { - dev_err(&gadget->dev, "invalid number of LUNs: %u\n", nluns); - return ERR_PTR(-EINVAL); - } common = fsg_common_setup(common); if (IS_ERR(common)) @@ -2798,17 +2850,12 @@ struct fsg_common *fsg_common_init(struct fsg_common *common, } fsg_intf_desc.iInterface = us[FSG_STRING_INTERFACE].id; - /* - * Create the LUNs, open their backing files, and register the - * LUN devices in sysfs. - */ - curlun_it = kcalloc(nluns, sizeof(*curlun_it), GFP_KERNEL); - if (unlikely(!curlun_it)) { - rc = -ENOMEM; - goto error_release; - } - common->luns = curlun_it; + rc = fsg_common_set_nluns(common, cfg->nluns); + if (rc) + goto error_release; + curlun_it = common->luns; + nluns = cfg->nluns; for (i = 0, lcfg = cfg->luns; i < nluns; ++i, ++curlun_it, ++lcfg) { struct fsg_lun *curlun; @@ -2866,7 +2913,6 @@ struct fsg_common *fsg_common_init(struct fsg_common *common, goto error_luns; } } - common->nluns = nluns; /* Prepare inquiryString */ diff --git a/drivers/usb/gadget/f_mass_storage.h b/drivers/usb/gadget/f_mass_storage.h index a00f51a1d94b..f98c792f36b0 100644 --- a/drivers/usb/gadget/f_mass_storage.h +++ b/drivers/usb/gadget/f_mass_storage.h @@ -106,6 +106,14 @@ void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs); int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n); +void fsg_common_remove_lun(struct fsg_lun *lun, bool sysfs); + +void fsg_common_remove_luns(struct fsg_common *common); + +void fsg_common_free_luns(struct fsg_common *common); + +int fsg_common_set_nluns(struct fsg_common *common, int nluns); + void fsg_config_from_params(struct fsg_config *cfg, const struct fsg_module_parameters *params, unsigned int fsg_num_buffers); -- 2.20.1