diff options
| -rw-r--r-- | drivers/usb/gadget/f_fs.c | 22 | ||||
| -rw-r--r-- | drivers/usb/gadget/u_fs.h | 7 |
2 files changed, 19 insertions, 10 deletions
diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c index eb5cb2b4b90d..5bfacf8b9e6e 100644 --- a/drivers/usb/gadget/f_fs.c +++ b/drivers/usb/gadget/f_fs.c @@ -99,6 +99,14 @@ static struct ffs_function *ffs_func_from_usb(struct usb_function *f) } +static inline enum ffs_setup_state +ffs_setup_state_clear_cancelled(struct ffs_data *ffs) +{ + return (enum ffs_setup_state) + cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); +} + + static void ffs_func_eps_disable(struct ffs_function *func); static int __must_check ffs_func_eps_enable(struct ffs_function *func); @@ -246,7 +254,7 @@ static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, ENTER(); /* Fast check if setup was canceled */ - if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELLED) + if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) return -EIDRM; /* Acquire mutex */ @@ -312,7 +320,7 @@ static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, * rather then _irqsave */ spin_lock_irq(&ffs->ev.waitq.lock); - switch (FFS_SETUP_STATE(ffs)) { + switch (ffs_setup_state_clear_cancelled(ffs)) { case FFS_SETUP_CANCELLED: ret = -EIDRM; goto done_spin; @@ -357,7 +365,8 @@ static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, * transition can be performed and it's protected by * mutex. */ - if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELLED) { + if (ffs_setup_state_clear_cancelled(ffs) == + FFS_SETUP_CANCELLED) { ret = -EIDRM; done_spin: spin_unlock_irq(&ffs->ev.waitq.lock); @@ -423,7 +432,7 @@ static ssize_t ffs_ep0_read(struct file *file, char __user *buf, ENTER(); /* Fast check if setup was canceled */ - if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELLED) + if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) return -EIDRM; /* Acquire mutex */ @@ -443,7 +452,7 @@ static ssize_t ffs_ep0_read(struct file *file, char __user *buf, */ spin_lock_irq(&ffs->ev.waitq.lock); - switch (FFS_SETUP_STATE(ffs)) { + switch (ffs_setup_state_clear_cancelled(ffs)) { case FFS_SETUP_CANCELLED: ret = -EIDRM; break; @@ -491,7 +500,8 @@ static ssize_t ffs_ep0_read(struct file *file, char __user *buf, spin_lock_irq(&ffs->ev.waitq.lock); /* See ffs_ep0_write() */ - if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELLED) { + if (ffs_setup_state_clear_cancelled(ffs) == + FFS_SETUP_CANCELLED) { ret = -EIDRM; break; } diff --git a/drivers/usb/gadget/u_fs.h b/drivers/usb/gadget/u_fs.h index 38012bcfe9ec..78263cc36df8 100644 --- a/drivers/usb/gadget/u_fs.h +++ b/drivers/usb/gadget/u_fs.h @@ -172,13 +172,12 @@ struct ffs_data { * happens only in ep0 i/o which is P: mutex * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELLED -- P: ev.waitq.lock * + FFS_SETUP_CANCELLED -> FFS_NO_SETUP -- cmpxchg + * + * This field should never be accessed directly and instead + * ffs_setup_state_clear_cancelled function should be used. */ enum ffs_setup_state setup_state; -#define FFS_SETUP_STATE(ffs) \ - ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \ - FFS_SETUP_CANCELLED, FFS_NO_SETUP)) - /* Events & such. */ struct { u8 types[4]; |