Use the guard(mutex) macro for handle mutex lock/unlocks. Signed-off-by: Marcus Folkesson <marcus.folkesson@xxxxxxxxx> --- Changes in v3: - Rename retval->error in pxrc_open() as it now only holds error code - Return early instead of assign retval in pxrc_resume() - Link to v2: https://lore.kernel.org/r/20231201-pxrc-guard-v2-1-714779672bc8@xxxxxxxxx Changes in v2: - Add guard in pxrc_open() - Link to v1: https://lore.kernel.org/r/20231201-pxrc-guard-v1-1-38937e657368@xxxxxxxxx --- drivers/input/joystick/pxrc.c | 42 ++++++++++++++++++------------------------ 1 file changed, 18 insertions(+), 24 deletions(-) diff --git a/drivers/input/joystick/pxrc.c b/drivers/input/joystick/pxrc.c index ea2bf5951d67..52d9eab667b7 100644 --- a/drivers/input/joystick/pxrc.c +++ b/drivers/input/joystick/pxrc.c @@ -5,15 +5,17 @@ * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@xxxxxxxxx> */ -#include <linux/kernel.h> +#include <linux/cleanup.h> #include <linux/errno.h> -#include <linux/slab.h> +#include <linux/input.h> +#include <linux/kernel.h> #include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.h> #include <linux/uaccess.h> + #include <linux/usb.h> #include <linux/usb/input.h> -#include <linux/mutex.h> -#include <linux/input.h> #define PXRC_VENDOR_ID 0x1781 #define PXRC_PRODUCT_ID 0x0898 @@ -81,33 +83,28 @@ static void pxrc_usb_irq(struct urb *urb) static int pxrc_open(struct input_dev *input) { struct pxrc *pxrc = input_get_drvdata(input); - int retval; + int error; - mutex_lock(&pxrc->pm_mutex); - retval = usb_submit_urb(pxrc->urb, GFP_KERNEL); - if (retval) { + guard(mutex)(&pxrc->pm_mutex); + error = usb_submit_urb(pxrc->urb, GFP_KERNEL); + if (error) { dev_err(&pxrc->intf->dev, "%s - usb_submit_urb failed, error: %d\n", - __func__, retval); - retval = -EIO; - goto out; + __func__, error); + return -EIO; } pxrc->is_open = true; - -out: - mutex_unlock(&pxrc->pm_mutex); - return retval; + return 0; } static void pxrc_close(struct input_dev *input) { struct pxrc *pxrc = input_get_drvdata(input); - mutex_lock(&pxrc->pm_mutex); + guard(mutex)(&pxrc->pm_mutex); usb_kill_urb(pxrc->urb); pxrc->is_open = false; - mutex_unlock(&pxrc->pm_mutex); } static void pxrc_free_urb(void *_pxrc) @@ -208,10 +205,9 @@ static int pxrc_suspend(struct usb_interface *intf, pm_message_t message) { struct pxrc *pxrc = usb_get_intfdata(intf); - mutex_lock(&pxrc->pm_mutex); + guard(mutex)(&pxrc->pm_mutex); if (pxrc->is_open) usb_kill_urb(pxrc->urb); - mutex_unlock(&pxrc->pm_mutex); return 0; } @@ -219,14 +215,12 @@ static int pxrc_suspend(struct usb_interface *intf, pm_message_t message) static int pxrc_resume(struct usb_interface *intf) { struct pxrc *pxrc = usb_get_intfdata(intf); - int retval = 0; - mutex_lock(&pxrc->pm_mutex); + guard(mutex)(&pxrc->pm_mutex); if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0) - retval = -EIO; + return -EIO; - mutex_unlock(&pxrc->pm_mutex); - return retval; + return 0; } static int pxrc_pre_reset(struct usb_interface *intf) --- base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa change-id: 20231201-pxrc-guard-03dc35771b36 Best regards, -- Marcus Folkesson <marcus.folkesson@xxxxxxxxx>
