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usb: gadget: storage_common: pass filesem to fsg_store_cdrom

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If cdrom flag is set ro flag is implied. Try setting the ro first, and
only if it succeeds set the cdrom flag.

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 2013-10-15 08:33:13 +02:00 committed by Felipe Balbi
parent 81a1d5ea66
commit b879863679
3 changed files with 39 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/usb/gadget/f_mass_storage.c
View File

@ -3281,7 +3281,12 @@ static ssize_t fsg_lun_opts_cdrom_show(struct fsg_lun_opts *opts, char *page)
static ssize_t fsg_lun_opts_cdrom_store(struct fsg_lun_opts *opts,
const char *page, size_t len)
{
return fsg_store_cdrom(opts->lun, page, len);
struct fsg_opts *fsg_opts;
fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
return fsg_store_cdrom(opts->lun, &fsg_opts->common->filesem, page,
len);
}
static struct fsg_lun_opts_attribute fsg_lun_opts_cdrom =

42
drivers/usb/gadget/storage_common.c
View File

@ -371,6 +371,23 @@ ssize_t fsg_show_removable(struct fsg_lun *curlun, char *buf)
}
EXPORT_SYMBOL(fsg_show_removable);
/*
* The caller must hold fsg->filesem for reading when calling this function.
*/
static ssize_t _fsg_store_ro(struct fsg_lun *curlun, bool ro)
{
if (fsg_lun_is_open(curlun)) {
LDBG(curlun, "read-only status change prevented\n");
return -EBUSY;
}
curlun->ro = ro;
curlun->initially_ro = ro;
LDBG(curlun, "read-only status set to %d\n", curlun->ro);
return 0;
}
ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem,
const char *buf, size_t count)
{
@ -386,16 +403,11 @@ ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem,
* backing file is closed.
*/
down_read(filesem);
if (fsg_lun_is_open(curlun)) {
LDBG(curlun, "read-only status change prevented\n");
rc = -EBUSY;
} else {
curlun->ro = ro;
curlun->initially_ro = ro;
LDBG(curlun, "read-only status set to %d\n", curlun->ro);
rc = _fsg_store_ro(curlun, ro);
if (!rc)
rc = count;
}
up_read(filesem);
return rc;
}
EXPORT_SYMBOL(fsg_store_ro);
@ -450,7 +462,8 @@ ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
}
EXPORT_SYMBOL(fsg_store_file);
ssize_t fsg_store_cdrom(struct fsg_lun *curlun, const char *buf, size_t count)
ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem,
const char *buf, size_t count)
{
bool cdrom;
int ret;
@ -459,9 +472,16 @@ ssize_t fsg_store_cdrom(struct fsg_lun *curlun, const char *buf, size_t count)
if (ret)
return ret;
curlun->cdrom = cdrom;
down_read(filesem);
ret = cdrom ? _fsg_store_ro(curlun, true) : 0;
return count;
if (!ret) {
curlun->cdrom = cdrom;
ret = count;
}
up_read(filesem);
return ret;
}
EXPORT_SYMBOL(fsg_store_cdrom);

3
drivers/usb/gadget/storage_common.h
View File

@ -221,7 +221,8 @@ ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem,
ssize_t fsg_store_nofua(struct fsg_lun *curlun, const char *buf, size_t count);
ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
const char *buf, size_t count);
ssize_t fsg_store_cdrom(struct fsg_lun *curlun, const char *buf, size_t count);
ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem,
const char *buf, size_t count);
ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf,
size_t count);