diff options
| author | Michal Nazarewicz <mina86@mina86.com> | 2015-06-19 23:56:34 +0200 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2015-08-10 09:54:13 +0100 |
| commit | be30468aaf6ea7ca81d657cf22f530e108727735 (patch) | |
| tree | 93f900e1dd9c461b6dea0c6a598b485bb3d98ae9 | |
| parent | 6645294d4b472bbcc98e3367499dc02637d9a609 (diff) | |
usb: f_mass_storage: limit number of reported LUNs
commit 8515bac01a983d277148e4fcc5f235bf603de577 upstream.
Mass storage function created via configfs always reports eight LUNs
to the hosts even if only one LUN has been configured. Adjust the
number when the USB function is allocated based on LUNs that user
has created.
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
[ luis: backported to 3.16:
- file rename: drivers/usb/gadget/function/f_mass_storage.c ->
drivers/usb/gadget/f_mass_storage.c ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
| -rw-r--r-- | drivers/usb/gadget/f_mass_storage.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c index b96393908860..53f4d4a868b5 100644 --- a/drivers/usb/gadget/f_mass_storage.c +++ b/drivers/usb/gadget/f_mass_storage.c @@ -2819,7 +2819,7 @@ int fsg_common_set_nluns(struct fsg_common *common, int nluns) return -EINVAL; } - curlun = kcalloc(nluns, sizeof(*curlun), GFP_KERNEL); + curlun = kcalloc(FSG_MAX_LUNS, sizeof(*curlun), GFP_KERNEL); if (unlikely(!curlun)) return -ENOMEM; @@ -2829,8 +2829,6 @@ int fsg_common_set_nluns(struct fsg_common *common, int nluns) common->luns = curlun; common->nluns = nluns; - pr_info("Number of LUNs=%d\n", common->nluns); - return 0; } EXPORT_SYMBOL_GPL(fsg_common_set_nluns); @@ -3604,14 +3602,26 @@ 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); + fsg->function.name = FSG_DRIVER_DESC; fsg->function.bind = fsg_bind; fsg->function.unbind = fsg_unbind; |