Commit be30468a authored by Michal Nazarewicz's avatar Michal Nazarewicz Committed by Luis Henriques

usb: f_mass_storage: limit number of reported LUNs

commit 8515bac0 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: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: default avatarMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: default avatarFelipe 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: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 6645294d
......@@ -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;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment