This patch replace dynamicly allocated luns array with static one. This simplifies the code of mass storage function and modules. Signed-off-by: Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx> Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx> -- IMPORTANT: This patch depends on patch: usb: gadget: mass_storage: Fix freeing luns sysfs implementation http://marc.info/?l=linux-usb&m=143834268900540&w=2 Changes since v1: - remove all luns before creating new (call fsg_common_remove_luns() in fsg_common_create_luns()) --- drivers/usb/gadget/function/f_mass_storage.c | 127 ++++++++++---------------- drivers/usb/gadget/function/f_mass_storage.h | 4 - drivers/usb/gadget/legacy/acm_ms.c | 6 -- drivers/usb/gadget/legacy/mass_storage.c | 6 -- drivers/usb/gadget/legacy/multi.c | 6 -- drivers/usb/gadget/legacy/nokia.c | 14 +-- 6 files changed, 50 insertions(+), 113 deletions(-) diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c index 9870913..04c3bb6 100644 --- a/drivers/usb/gadget/function/f_mass_storage.c +++ b/drivers/usb/gadget/function/f_mass_storage.c @@ -279,9 +279,8 @@ struct fsg_common { int cmnd_size; u8 cmnd[MAX_COMMAND_SIZE]; - unsigned int nluns; unsigned int lun; - struct fsg_lun **luns; + struct fsg_lun *luns[FSG_MAX_LUNS]; struct fsg_lun *curlun; unsigned int bulk_out_maxpacket; @@ -490,6 +489,16 @@ static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) spin_unlock(&common->lock); } +static int _fsg_common_get_max_lun(struct fsg_common *common) +{ + int i = ARRAY_SIZE(common->luns) - 1; + + while (i >= 0 && !common->luns[i]) + --i; + + return i; +} + static int fsg_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { @@ -533,7 +542,7 @@ static int fsg_setup(struct usb_function *f, w_length != 1) return -EDOM; VDBG(fsg, "get max LUN\n"); - *(u8 *)req->buf = fsg->common->nluns - 1; + *(u8 *)req->buf = _fsg_common_get_max_lun(fsg->common); /* Respond with data/status */ req->length = min((u16)1, w_length); @@ -2131,8 +2140,9 @@ static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) } /* Is the CBW meaningful? */ - if (cbw->Lun >= FSG_MAX_LUNS || cbw->Flags & ~US_BULK_FLAG_IN || - cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) { + if (cbw->Lun >= ARRAY_SIZE(common->luns) || + cbw->Flags & ~US_BULK_FLAG_IN || cbw->Length <= 0 || + cbw->Length > MAX_COMMAND_SIZE) { DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " "cmdlen %u\n", cbw->Lun, cbw->Flags, cbw->Length); @@ -2159,7 +2169,7 @@ static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) if (common->data_size == 0) common->data_dir = DATA_DIR_NONE; common->lun = cbw->Lun; - if (common->lun < common->nluns) + if (common->lun < ARRAY_SIZE(common->luns)) common->curlun = common->luns[common->lun]; else common->curlun = NULL; @@ -2307,7 +2317,7 @@ reset: } common->running = 1; - for (i = 0; i < common->nluns; ++i) + for (i = 0; i < ARRAY_SIZE(common->luns); ++i) if (common->luns[i]) common->luns[i]->unit_attention_data = SS_RESET_OCCURRED; @@ -2409,7 +2419,7 @@ static void handle_exception(struct fsg_common *common) if (old_state == FSG_STATE_ABORT_BULK_OUT) common->state = FSG_STATE_STATUS_PHASE; else { - for (i = 0; i < common->nluns; ++i) { + for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { curlun = common->luns[i]; if (!curlun) continue; @@ -2453,7 +2463,7 @@ static void handle_exception(struct fsg_common *common) * a waste of time. Ditto for the INTERFACE_CHANGE and * CONFIG_CHANGE cases. */ - /* for (i = 0; i < common->nluns; ++i) */ + /* for (i = 0; i < common->ARRAY_SIZE(common->luns); ++i) */ /* if (common->luns[i]) */ /* common->luns[i]->unit_attention_data = */ /* SS_RESET_OCCURRED; */ @@ -2552,12 +2562,11 @@ static int fsg_main_thread(void *common_) if (!common->ops || !common->ops->thread_exits || common->ops->thread_exits(common) < 0) { - struct fsg_lun **curlun_it = common->luns; - unsigned i = common->nluns; + int i; down_write(&common->filesem); - for (; i--; ++curlun_it) { - struct fsg_lun *curlun = *curlun_it; + for (i = 0; i < ARRAY_SIZE(common->luns); --i) { + struct fsg_lun *curlun = common->luns[i]; if (!curlun || !fsg_lun_is_open(curlun)) continue; @@ -2676,6 +2685,7 @@ static struct fsg_common *fsg_common_setup(struct fsg_common *common) init_completion(&common->thread_notifier); init_waitqueue_head(&common->fsg_wait); common->state = FSG_STATE_TERMINATED; + memset(common->luns, 0, sizeof(common->luns)); return common; } @@ -2764,42 +2774,10 @@ static void _fsg_common_remove_luns(struct fsg_common *common, int n) void fsg_common_remove_luns(struct fsg_common *common) { - _fsg_common_remove_luns(common, common->nluns); + _fsg_common_remove_luns(common, ARRAY_SIZE(common->luns)); } EXPORT_SYMBOL_GPL(fsg_common_remove_luns); -void fsg_common_free_luns(struct fsg_common *common) -{ - fsg_common_remove_luns(common); - kfree(common->luns); - common->luns = NULL; -} -EXPORT_SYMBOL_GPL(fsg_common_free_luns); - -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(FSG_MAX_LUNS, sizeof(*curlun), GFP_KERNEL); - if (unlikely(!curlun)) - return -ENOMEM; - - if (common->luns) - fsg_common_free_luns(common); - - common->luns = curlun; - common->nluns = nluns; - - return 0; -} -EXPORT_SYMBOL_GPL(fsg_common_set_nluns); - void fsg_common_set_ops(struct fsg_common *common, const struct fsg_operations *ops) { @@ -2881,7 +2859,7 @@ int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg, char *pathbuf, *p; int rc = -ENOMEM; - if (!common->nluns || !common->luns) + if (id >= ARRAY_SIZE(common->luns)) return -ENODEV; if (common->luns[id]) @@ -2965,14 +2943,16 @@ int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg) char buf[8]; /* enough for 100000000 different numbers, decimal */ int i, rc; - for (i = 0; i < common->nluns; ++i) { + fsg_common_remove_luns(common); + + for (i = 0; i < cfg->nluns; ++i) { snprintf(buf, sizeof(buf), "lun%d", i); rc = fsg_common_create_lun(common, &cfg->luns[i], i, buf, NULL); if (rc) goto fail; } - pr_info("Number of LUNs=%d\n", common->nluns); + pr_info("Number of LUNs=%d\n", cfg->nluns); return 0; @@ -3021,6 +3001,7 @@ EXPORT_SYMBOL_GPL(fsg_common_run_thread); static void fsg_common_release(struct kref *ref) { 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 */ if (common->state != FSG_STATE_TERMINATED) { @@ -3028,22 +3009,14 @@ static void fsg_common_release(struct kref *ref) wait_for_completion(&common->thread_notifier); } - if (likely(common->luns)) { - struct fsg_lun **lun_it = common->luns; - unsigned i = common->nluns; - - /* In error recovery common->nluns may be zero. */ - for (; i; --i, ++lun_it) { - struct fsg_lun *lun = *lun_it; - if (!lun) - continue; - fsg_lun_close(lun); + for (i = 0; i < ARRAY_SIZE(common->luns); ++i) { + struct fsg_lun *lun = common->luns[i]; + if (!lun) + continue; + fsg_lun_close(lun); if (device_is_registered(&lun->dev)) - device_unregister(&lun->dev); - kfree(lun); - } - - kfree(common->luns); + device_unregister(&lun->dev); + kfree(lun); } _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers); @@ -3057,6 +3030,7 @@ static void fsg_common_release(struct kref *ref) static int fsg_bind(struct usb_configuration *c, struct usb_function *f) { struct fsg_dev *fsg = fsg_from_func(f); + struct fsg_common *common = fsg->common; struct usb_gadget *gadget = c->cdev->gadget; int i; struct usb_ep *ep; @@ -3064,6 +3038,13 @@ static int fsg_bind(struct usb_configuration *c, struct usb_function *f) int ret; struct fsg_opts *opts; + /* Don't allow to bind if we don't have at least one LUN */ + ret = _fsg_common_get_max_lun(common); + if (ret < 0) { + pr_err("There should be at least one LUN.\n"); + return -EINVAL; + } + opts = fsg_opts_from_func_inst(f->fi); if (!opts->no_configfs) { ret = fsg_common_set_cdev(fsg->common, c->cdev, @@ -3517,14 +3498,11 @@ static struct usb_function_instance *fsg_alloc_inst(void) rc = PTR_ERR(opts->common); goto release_opts; } - rc = fsg_common_set_nluns(opts->common, FSG_MAX_LUNS); - if (rc) - goto release_opts; rc = fsg_common_set_num_buffers(opts->common, CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS); if (rc) - goto release_luns; + goto release_opts; pr_info(FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n"); @@ -3547,8 +3525,6 @@ static struct usb_function_instance *fsg_alloc_inst(void) release_buffers: fsg_common_free_buffers(opts->common); -release_luns: - kfree(opts->common->luns); release_opts: kfree(opts); return ERR_PTR(rc); @@ -3574,23 +3550,12 @@ static struct usb_function *fsg_alloc(struct usb_function_instance *fi) struct fsg_opts *opts = fsg_opts_from_func_inst(fi); struct fsg_common *common = opts->common; struct fsg_dev *fsg; - unsigned nluns, i; fsg = kzalloc(sizeof(*fsg), GFP_KERNEL); if (unlikely(!fsg)) return ERR_PTR(-ENOMEM); mutex_lock(&opts->lock); - if (!opts->refcnt) { - for (nluns = i = 0; i < FSG_MAX_LUNS; ++i) - if (common->luns[i]) - nluns = i + 1; - if (!nluns) - pr_warn("No LUNS defined, continuing anyway\n"); - else - common->nluns = nluns; - pr_info("Number of LUNs=%u\n", common->nluns); - } opts->refcnt++; mutex_unlock(&opts->lock); diff --git a/drivers/usb/gadget/function/f_mass_storage.h b/drivers/usb/gadget/function/f_mass_storage.h index 37bc94c..445df67 100644 --- a/drivers/usb/gadget/function/f_mass_storage.h +++ b/drivers/usb/gadget/function/f_mass_storage.h @@ -141,10 +141,6 @@ void fsg_common_remove_lun(struct fsg_lun *lun); 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_common_set_ops(struct fsg_common *common, const struct fsg_operations *ops); diff --git a/drivers/usb/gadget/legacy/acm_ms.c b/drivers/usb/gadget/legacy/acm_ms.c index 4d8adb4..4b158e2 100644 --- a/drivers/usb/gadget/legacy/acm_ms.c +++ b/drivers/usb/gadget/legacy/acm_ms.c @@ -186,10 +186,6 @@ static int acm_ms_bind(struct usb_composite_dev *cdev) if (status) goto fail; - status = fsg_common_set_nluns(opts->common, config.nluns); - if (status) - goto fail_set_nluns; - status = fsg_common_set_cdev(opts->common, cdev, config.can_stall); if (status) goto fail_set_cdev; @@ -239,8 +235,6 @@ fail_otg_desc: fail_string_ids: fsg_common_remove_luns(opts->common); fail_set_cdev: - fsg_common_free_luns(opts->common); -fail_set_nluns: fsg_common_free_buffers(opts->common); fail: usb_put_function_instance(fi_msg); diff --git a/drivers/usb/gadget/legacy/mass_storage.c b/drivers/usb/gadget/legacy/mass_storage.c index ab1a42c..bda3c51 100644 --- a/drivers/usb/gadget/legacy/mass_storage.c +++ b/drivers/usb/gadget/legacy/mass_storage.c @@ -177,10 +177,6 @@ static int msg_bind(struct usb_composite_dev *cdev) if (status) goto fail; - status = fsg_common_set_nluns(opts->common, config.nluns); - if (status) - goto fail_set_nluns; - fsg_common_set_ops(opts->common, &ops); status = fsg_common_set_cdev(opts->common, cdev, config.can_stall); @@ -227,8 +223,6 @@ fail_otg_desc: fail_string_ids: fsg_common_remove_luns(opts->common); fail_set_cdev: - fsg_common_free_luns(opts->common); -fail_set_nluns: fsg_common_free_buffers(opts->common); fail: usb_put_function_instance(fi_msg); diff --git a/drivers/usb/gadget/legacy/multi.c b/drivers/usb/gadget/legacy/multi.c index c38ead1..4fe794d 100644 --- a/drivers/usb/gadget/legacy/multi.c +++ b/drivers/usb/gadget/legacy/multi.c @@ -393,10 +393,6 @@ static int __ref multi_bind(struct usb_composite_dev *cdev) if (status) goto fail2; - status = fsg_common_set_nluns(fsg_opts->common, config.nluns); - if (status) - goto fail_set_nluns; - status = fsg_common_set_cdev(fsg_opts->common, cdev, config.can_stall); if (status) goto fail_set_cdev; @@ -448,8 +444,6 @@ fail_otg_desc: fail_string_ids: fsg_common_remove_luns(fsg_opts->common); fail_set_cdev: - fsg_common_free_luns(fsg_opts->common); -fail_set_nluns: fsg_common_free_buffers(fsg_opts->common); fail2: usb_put_function_instance(fi_msg); diff --git a/drivers/usb/gadget/legacy/nokia.c b/drivers/usb/gadget/legacy/nokia.c index 264c97e..c20f3b5 100644 --- a/drivers/usb/gadget/legacy/nokia.c +++ b/drivers/usb/gadget/legacy/nokia.c @@ -339,19 +339,15 @@ static int nokia_bind(struct usb_composite_dev *cdev) if (status) goto err_msg_inst; - status = fsg_common_set_nluns(fsg_opts->common, fsg_config.nluns); - if (status) - goto err_msg_buf; - status = fsg_common_set_cdev(fsg_opts->common, cdev, fsg_config.can_stall); if (status) - goto err_msg_set_nluns; + goto err_msg_buf; fsg_common_set_sysfs(fsg_opts->common, true); status = fsg_common_create_luns(fsg_opts->common, &fsg_config); if (status) - goto err_msg_set_nluns; + goto err_msg_buf; fsg_common_set_inquiry_string(fsg_opts->common, fsg_config.vendor_name, fsg_config.product_name); @@ -360,7 +356,7 @@ static int nokia_bind(struct usb_composite_dev *cdev) status = usb_add_config(cdev, &nokia_config_500ma_driver, nokia_bind_config); if (status < 0) - goto err_msg_set_cdev; + goto err_msg_luns; status = usb_add_config(cdev, &nokia_config_100ma_driver, nokia_bind_config); @@ -381,10 +377,8 @@ err_put_cfg1: if (!IS_ERR_OR_NULL(f_phonet_cfg1)) usb_put_function(f_phonet_cfg1); usb_put_function(f_ecm_cfg1); -err_msg_set_cdev: +err_msg_luns: fsg_common_remove_luns(fsg_opts->common); -err_msg_set_nluns: - fsg_common_free_luns(fsg_opts->common); err_msg_buf: fsg_common_free_buffers(fsg_opts->common); err_msg_inst: -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
