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authorFrancesco VIRLINZI <francesco.virlinzi@st.com>2015-01-05 11:04:13 +0100
committerLinus Walleij <linus.walleij@linaro.org>2015-01-07 10:43:41 +0100
commit96d16c3088a924a44175d2923cc0eafa0d8bbecc (patch)
tree03308ef2873f09f6e45e491e0d1e788fa4e99e0e /drivers/pinctrl
parentf2dd028c2632d107c26b1daed543d9efd4f0decd (diff)
downloadkernel-96d16c3088a924a44175d2923cc0eafa0d8bbecc.tar.gz
pinctrl: st: avoid multiple mutex lock
Using the sysfs inteface to inspect the pins configuration the system can walk around a path which acquires the same mutex twice. On STiH407 platform, for example : cat /sys/kernel/debug/pinctrl/920f080.pin-controller-front0/pinconf-pins hangs the kernel and never returns. With this patch the mutex is temporary freed. Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/pinctrl-st.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 7c9d51382248..87570e68deed 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -1012,8 +1012,10 @@ static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin_id)
{
unsigned long config;
- st_pinconf_get(pctldev, pin_id, &config);
+ mutex_unlock(&pctldev->mutex);
+ st_pinconf_get(pctldev, pin_id, &config);
+ mutex_lock(&pctldev->mutex);
seq_printf(s, "[OE:%ld,PU:%ld,OD:%ld]\n"
"\t\t[retime:%ld,invclk:%ld,clknotdat:%ld,"
"de:%ld,rt-clk:%ld,rt-delay:%ld]",