diff options
| author | Richard Genoud <richard.genoud@gmail.com> | 2013-03-25 15:47:22 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-03-27 23:17:12 +0100 |
| commit | 3102a76cfbf9ac4ae0cf54c7452f7ba4292a4760 (patch) | |
| tree | c7ae2486f3c0cd31476546993906de4f9b199315 /drivers/pinctrl | |
| parent | d3cee8305b48316ea416a73c763be3cb04bbc82b (diff) | |
| download | linux-3102a76cfbf9ac4ae0cf54c7452f7ba4292a4760.tar.bz2 | |
pinctrl: disable and free setting in select_state in case of error
If enabling a pin fails in pinctrl_select_state_locked(), all the
previous enabled pins have to be disabled to get back to the previous
state.
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/core.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 971234599d72..09f79f251800 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -930,7 +930,7 @@ static int pinctrl_select_state_locked(struct pinctrl *p, } } - p->state = state; + p->state = NULL; /* Apply all the settings for the new state */ list_for_each_entry(setting, &state->settings, node) { @@ -946,13 +946,35 @@ static int pinctrl_select_state_locked(struct pinctrl *p, ret = -EINVAL; break; } + if (ret < 0) { - /* FIXME: Difficult to return to prev state */ - return ret; + goto unapply_new_state; } } + p->state = state; + return 0; + +unapply_new_state: + pr_info("Error applying setting, reverse things back\n"); + + /* + * If the loop stopped on the 1st entry, nothing has been enabled, + * so jump directly to the 2nd phase + */ + if (list_entry(&setting->node, typeof(*setting), node) == + list_first_entry(&state->settings, typeof(*setting), node)) + goto reapply_old_state; + + list_for_each_entry(setting2, &state->settings, node) { + if (&setting2->node == &setting->node) + break; + pinctrl_free_setting(true, setting2); + } +reapply_old_state: + /* FIXME: re-enable old setting */ + return ret; } /** |