diff options
Diffstat (limited to 'target/linux/ipq806x/patches/0026-pinctrl-msm-Silence-recursive-lockdep-warning.patch')
-rw-r--r-- | target/linux/ipq806x/patches/0026-pinctrl-msm-Silence-recursive-lockdep-warning.patch | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/target/linux/ipq806x/patches/0026-pinctrl-msm-Silence-recursive-lockdep-warning.patch b/target/linux/ipq806x/patches/0026-pinctrl-msm-Silence-recursive-lockdep-warning.patch deleted file mode 100644 index fe5008e..0000000 --- a/target/linux/ipq806x/patches/0026-pinctrl-msm-Silence-recursive-lockdep-warning.patch +++ /dev/null @@ -1,68 +0,0 @@ -From 9588c91936434166007c3a15ad7f4e2f3729c5e7 Mon Sep 17 00:00:00 2001 -From: Stephen Boyd <sboyd@codeaurora.org> -Date: Thu, 6 Mar 2014 22:44:40 -0800 -Subject: [PATCH 026/182] pinctrl: msm: Silence recursive lockdep warning - -If a driver calls enable_irq_wake() on a gpio turned interrupt -from the msm pinctrl driver we'll get a lockdep warning like so: - -============================================= -[ INFO: possible recursive locking detected ] -3.14.0-rc3 #2 Not tainted ---------------------------------------------- -modprobe/52 is trying to acquire lock: - (&irq_desc_lock_class){-.....}, at: [<c026aea0>] __irq_get_desc_lock+0x48/0x88 - -but task is already holding lock: - (&irq_desc_lock_class){-.....}, at: [<c026aea0>] __irq_get_desc_lock+0x48/0x88 - -other info that might help us debug this: - Possible unsafe locking scenario: - - CPU0 - ---- - lock(&irq_desc_lock_class); - lock(&irq_desc_lock_class); - - *** DEADLOCK *** - - May be due to missing lock nesting notation - -4 locks held by modprobe/52: - #0: (&__lockdep_no_validate__){......}, at: [<c04f2864>] __driver_attach+0x48/0x98 - #1: (&__lockdep_no_validate__){......}, at: [<c04f2874>] __driver_attach+0x58/0x98 - #2: (&irq_desc_lock_class){-.....}, at: [<c026aea0>] __irq_get_desc_lock+0x48/0x88 - #3: (&(&pctrl->lock)->rlock){......}, at: [<c04bb4b8>] msm_gpio_irq_set_wake+0x20/0xa8 - -Silence it by putting the gpios into their own lock class. - -Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> -Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> -Signed-off-by: Linus Walleij <linus.walleij@linaro.org> ---- - drivers/pinctrl/pinctrl-msm.c | 7 +++++++ - 1 file changed, 7 insertions(+) - ---- a/drivers/pinctrl/pinctrl-msm.c -+++ b/drivers/pinctrl/pinctrl-msm.c -@@ -857,6 +857,12 @@ static void msm_gpio_irq_handler(unsigne - chained_irq_exit(chip, desc); - } - -+/* -+ * This lock class tells lockdep that GPIO irqs are in a different -+ * category than their parents, so it won't report false recursion. -+ */ -+static struct lock_class_key gpio_lock_class; -+ - static int msm_gpio_init(struct msm_pinctrl *pctrl) - { - struct gpio_chip *chip; -@@ -895,6 +901,7 @@ static int msm_gpio_init(struct msm_pinc - - for (i = 0; i < chip->ngpio; i++) { - irq = irq_create_mapping(pctrl->domain, i); -+ irq_set_lockdep_class(irq, &gpio_lock_class); - irq_set_chip_and_handler(irq, &msm_gpio_irq_chip, handle_edge_irq); - irq_set_chip_data(irq, pctrl); - } |