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staging: most: fix retrieval of buffer availability

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This patch fixes the function channel_has_mbo that delivers the false
information in case two AIMs are using the same tx channel.

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 2016-01-12 14:00:03 +01:00 committed by Greg Kroah-Hartman
parent 5f858a61a8
commit cdc293d589
3 changed files with 14 additions and 8 deletions
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12
drivers/staging/most/aim-cdev/cdev.c
View File

@ -50,6 +50,11 @@ struct aim_channel {
static struct list_head channel_list;
static spinlock_t ch_list_lock;
static inline bool ch_has_mbo(struct aim_channel *c)
{
return channel_has_mbo(c->iface, c->channel_id, &cdev_aim) > 0;
}
static struct aim_channel *get_channel(struct most_interface *iface, int id)
{
struct aim_channel *channel, *tmp;
@ -279,11 +284,6 @@ start_copy:
return copied;
}
static inline bool __must_check IS_ERR_OR_FALSE(int x)
{
return x <= 0;
}
static unsigned int aim_poll(struct file *filp, poll_table *wait)
{
struct aim_channel *c = filp->private_data;
@ -295,7 +295,7 @@ static unsigned int aim_poll(struct file *filp, poll_table *wait)
if (!kfifo_is_empty(&c->fifo))
mask |= POLLIN | POLLRDNORM;
} else {
if (!IS_ERR_OR_FALSE(channel_has_mbo(c->iface, c->channel_id)))
if (ch_has_mbo(c))
mask |= POLLOUT | POLLWRNORM;
}
return mask;

7
drivers/staging/most/mostcore/core.c
View File

@ -1352,7 +1352,7 @@ most_c_obj *get_channel_by_iface(struct most_interface *iface, int id)
return i->channel[id];
}
int channel_has_mbo(struct most_interface *iface, int id)
int channel_has_mbo(struct most_interface *iface, int id, struct most_aim *aim)
{
struct most_c_obj *c = get_channel_by_iface(iface, id);
unsigned long flags;
@ -1361,6 +1361,11 @@ int channel_has_mbo(struct most_interface *iface, int id)
if (unlikely(!c))
return -EINVAL;
if (c->aim0.refs && c->aim1.refs &&
((aim == c->aim0.ptr && c->aim0.num_buffers <= 0) ||
(aim == c->aim1.ptr && c->aim1.num_buffers <= 0)))
return 0;
spin_lock_irqsave(&c->fifo_lock, flags);
empty = list_empty(&c->fifo);
spin_unlock_irqrestore(&c->fifo_lock, flags);

3
drivers/staging/most/mostcore/mostcore.h
View File

@ -310,7 +310,8 @@ int most_deregister_aim(struct most_aim *aim);
struct mbo *most_get_mbo(struct most_interface *iface, int channel_idx,
struct most_aim *);
void most_put_mbo(struct mbo *mbo);
int channel_has_mbo(struct most_interface *iface, int channel_idx);
int channel_has_mbo(struct most_interface *iface, int channel_idx,
struct most_aim *aim);
int most_start_channel(struct most_interface *iface, int channel_idx,
struct most_aim *);
int most_stop_channel(struct most_interface *iface, int channel_idx,