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usb: gadget: f_mass_storage: create lun handling helpers for use in fsg_common_init

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fsg_common_init is a lengthy function. Factor portions of it out.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz 2013-10-09 10:05:56 +02:00 committed by Felipe Balbi
parent 6313caace5
commit 7063417099
2 changed files with 71 additions and 17 deletions
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80
drivers/usb/gadget/f_mass_storage.c
View File

@ -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 */

8
drivers/usb/gadget/f_mass_storage.h
View File

@ -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);