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authorJim Lin <jilin@nvidia.com>2015-01-08 13:25:05 +0100
committerLinus Walleij <linus.walleij@linaro.org>2015-01-14 14:20:33 +0100
commitdb93facfb0ef542aa5d8079e47580b3e669a4d82 (patch)
treedcd2c575ba728082ad76d209aac3fe4a36f7e266 /drivers/pinctrl/freescale/pinctrl-imx1.h
parentpinctrl: rockchip: Avoid losing interrupts when supporting both edges (diff)
downloadlinux-db93facfb0ef542aa5d8079e47580b3e669a4d82.tar.xz
linux-db93facfb0ef542aa5d8079e47580b3e669a4d82.zip
pinctrl: Fix two deadlocks
This patch is to fix two deadlock cases. Deadlock 1: CPU #1 pinctrl_register-> pinctrl_get -> create_pinctrl (Holding lock pinctrl_maps_mutex) -> get_pinctrl_dev_from_devname (Trying to acquire lock pinctrldev_list_mutex) CPU #0 pinctrl_unregister (Holding lock pinctrldev_list_mutex) -> pinctrl_put ->> pinctrl_free -> pinctrl_dt_free_maps -> pinctrl_unregister_map (Trying to acquire lock pinctrl_maps_mutex) Simply to say CPU#1 is holding lock A and trying to acquire lock B, CPU#0 is holding lock B and trying to acquire lock A. Deadlock 2: CPU #3 pinctrl_register-> pinctrl_get -> create_pinctrl (Holding lock pinctrl_maps_mutex) -> get_pinctrl_dev_from_devname (Trying to acquire lock pinctrldev_list_mutex) CPU #2 pinctrl_unregister (Holding lock pctldev->mutex) -> pinctrl_put ->> pinctrl_free -> pinctrl_dt_free_maps -> pinctrl_unregister_map (Trying to acquire lock pinctrl_maps_mutex) CPU #0 tegra_gpio_request (Holding lock pinctrldev_list_mutex) -> pinctrl_get_device_gpio_range (Trying to acquire lock pctldev->mutex) Simply to say CPU#3 is holding lock A and trying to acquire lock D, CPU#2 is holding lock B and trying to acquire lock A, CPU#0 is holding lock D and trying to acquire lock B. Cc: Stable <stable@vger.kernel.org> Signed-off-by: Jim Lin <jilin@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/freescale/pinctrl-imx1.h')
0 files changed, 0 insertions, 0 deletions