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staging: most: remove stacked_mbo 

This patch makes use of kfifo_peek and kfifo_skip, which renders the
variable stacked_mbo useless. It is therefore removed.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2015-12-22 10:53:06 +01:00 committed by Greg Kroah-Hartman
parent b3c9f3c56c
commit f45b0fba43
1 changed files with 3 additions and 13 deletions
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16
drivers/staging/most/aim-cdev/cdev.c
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@ -41,7 +41,6 @@ struct aim_channel {
unsigned int channel_id;
dev_t devno;
size_t mbo_offs;
struct mbo *stacked_mbo;
DECLARE_KFIFO_PTR(fifo, typeof(struct mbo *));
int access_ref;
struct list_head list;
@ -87,9 +86,6 @@ static void stop_channel(struct aim_channel *c)
while (kfifo_out((struct kfifo *)&c->fifo, &mbo, 1))
most_put_mbo(mbo);
if (c->stacked_mbo)
most_put_mbo(c->stacked_mbo);
c->stacked_mbo = NULL;
most_stop_channel(c->iface, c->channel_id, &cdev_aim);
}
@ -143,6 +139,7 @@ static int aim_open(struct inode *inode, struct file *filp)
return -EBUSY;
}
c->mbo_offs = 0;
ret = most_start_channel(c->iface, c->channel_id, &cdev_aim);
if (!ret)
c->access_ref = 1;
@ -249,11 +246,7 @@ aim_read(struct file *filp, char __user *buf, size_t count, loff_t *offset)
struct aim_channel *c = filp->private_data;
mutex_lock(&c->io_mutex);
if (c->stacked_mbo) {
mbo = c->stacked_mbo;
goto start_copy;
}
while ((!kfifo_out(&c->fifo, &mbo, 1)) && (c->dev)) {
while (c->dev && !kfifo_peek(&c->fifo, &mbo)) {
mutex_unlock(&c->io_mutex);
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
@ -263,9 +256,7 @@ aim_read(struct file *filp, char __user *buf, size_t count, loff_t *offset)
return -ERESTARTSYS;
mutex_lock(&c->io_mutex);
}
c->stacked_mbo = mbo;
start_copy:
/* make sure we don't submit to gone devices */
if (unlikely(!c->dev)) {
mutex_unlock(&c->io_mutex);
@ -284,9 +275,9 @@ start_copy:
c->mbo_offs += copied;
if (c->mbo_offs >= mbo->processed_length) {
kfifo_skip(&c->fifo);
most_put_mbo(mbo);
c->mbo_offs = 0;
c->stacked_mbo = NULL;
}
mutex_unlock(&c->io_mutex);
return copied;
@ -466,7 +457,6 @@ static int aim_probe(struct most_interface *iface, int channel_id,
c->iface = iface;
c->cfg = cfg;
c->channel_id = channel_id;
c->mbo_offs = 0;
c->access_ref = 0;
spin_lock_init(&c->unlink);
INIT_KFIFO(c->fifo);