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| author | Andrzej Pietrasiewicz <andrzej.p@samsung.com> | 2013-10-15 08:33:13 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-10-15 13:52:08 +0200 |
| commit | b8798636798ee04feb0f1bb87eec0027e3f68d98 (patch) | |
| tree | e1fd22c9a2743d1d383d9ffc7dfcb7871b94c722 /drivers/usb/gadget/storage_common.c | |
| parent | usb: gadget: storage_common: use strtobool instead of kstrtouint (diff) | |
| download | linux-b8798636798ee04feb0f1bb87eec0027e3f68d98.tar.xz linux-b8798636798ee04feb0f1bb87eec0027e3f68d98.zip | |
usb: gadget: storage_common: pass filesem to fsg_store_cdrom
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>
Diffstat (limited to 'drivers/usb/gadget/storage_common.c')
| -rw-r--r-- | drivers/usb/gadget/storage_common.c | 42 |
1 files changed, 31 insertions, 11 deletions
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c index 8bd5f2d838db..ec20a1f50c2d 100644 --- a/drivers/usb/gadget/storage_common.c +++ b/drivers/usb/gadget/storage_common.c @@ -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); |