diff options
| author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-03-02 18:31:12 +0100 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2017-05-18 18:51:24 +0200 |
| commit | ddd6d240b26dcb8b8dc98bd493eba944dd97ebc8 (patch) | |
| tree | 3841ccf38b20b4e0b3adbb3aa12c801cff69450e /drivers/watchdog/pcwd_usb.c | |
| parent | 015b528644a84b0018d3286ecd6ea5f82dce0180 (diff) | |
| download | lwn-ddd6d240b26dcb8b8dc98bd493eba944dd97ebc8.tar.gz lwn-ddd6d240b26dcb8b8dc98bd493eba944dd97ebc8.zip | |
watchdog: sama5d4: fix race condition
WDT_MR and WDT_CR must not updated within three slow clock periods after
the last ping (write to WDT_CR or WDT_MR). Ensure enough time has elapsed
before writing those registers.
wdt_write() waits for 4 periods to ensure at least 3 edges are seen by the
IP.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Wenyou.Yang <wenyou.yang@microchip.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/pcwd_usb.c')
0 files changed, 0 insertions, 0 deletions