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| author |   Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-01-27 18:03:52 +0800 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2018-02-07 09:48:56 +0100 |
| commit | 06633ee14d5c9bff3b46be67be2824138c75594a (patch) | |
| tree | 4fa632e591f5f1d454aea2c8e8f9b7b956cd3f10 /drivers/bluetooth/hci_ll.c | |
| parent | Bluetooth: btmrvl_main: Replace GFP_ATOMIC with GFP_KERNEL in btmrvl_send_sync_cmd (diff) | |
| download | linux-dev-06633ee14d5c9bff3b46be67be2824138c75594a.tar.xz linux-dev-06633ee14d5c9bff3b46be67be2824138c75594a.zip | |
Bluetooth: hci_ll: Replace mdelay with msleep in download_firmware
download_firmware() is never called from atomic context.
It is only called by ll_setup() that is called only via function pointer
"->setup" used in hci_uart_setup() in drivers/bluetooth/hci_serdev.c and
drivers/bluetooth/hci_ldisc.c. hci_uart_setup() is called only
via function pointer "->setup" used in hci_dev_do_open()
in net/bluetooth/hci_core.c.
All of the above functions do not enter atomic context.
Besides, ll_setup() calls msleep() and hci_dev_do_open calls mutex_lock().
So it indicates that all the above functions call functions that can sleep.
Despite never getting called from atomic context, download_firmware()
calls mdelay() for busy wait.
That is not necessary and can be replaced with msleep to avoid busy wait.
This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/bluetooth/hci_ll.c')
| -rw-r--r-- | drivers/bluetooth/hci_ll.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/bluetooth/hci_ll.c b/drivers/bluetooth/hci_ll.c index 1b4417a623a4..2f30dcad96bd 100644 --- a/drivers/bluetooth/hci_ll.c +++ b/drivers/bluetooth/hci_ll.c @@ -650,7 +650,7 @@ static int download_firmware(struct ll_device *lldev) break; case ACTION_DELAY: /* sleep */ bt_dev_info(lldev->hu.hdev, "sleep command in scr"); - mdelay(((struct bts_action_delay *)action_ptr)->msec); + msleep(((struct bts_action_delay *)action_ptr)->msec); break; } len -= (sizeof(struct bts_action) + |