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Fix some odd logic in CC3000 semaphore handling. Noted by Vladimir Komendantskiy

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This commit is contained in:
Gregory Nutt
2016-02-10 09:50:28 -06:00
parent 2c0ad2564f
commit bf8120d51d
2 changed files with 25 additions and 72 deletions
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drivers/wireless/cc3000/cc3000.c
+21 -71
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@@ -211,27 +211,23 @@ uint8_t spi_readCommand[] = READ_COMMAND;
*
****************************************************************************/
static int cc3000_devtake(FAR struct cc3000_dev_s *priv)
static inline void cc3000_devtake(FAR struct cc3000_dev_s *priv)
{
int rv;
/* Take the semaphore (perhaps waiting) */
while ((rv = sem_wait(&priv->devsem)) != 0)
while (sem_wait(&priv->devsem) < 0)
{
/* The only case that an error should occur here is if the wait was awakened
* by a signal.
/* The only case that an error should occur here is if the wait was
* awakened by a signal.
*/
DEBUGASSERT(rv == OK || errno == EINTR);
DEBUGASSERT(errno == EINTR);
}
return rv;
}
static inline int cc3000_devgive(FAR struct cc3000_dev_s *priv)
static inline void cc3000_devgive(FAR struct cc3000_dev_s *priv)
{
return sem_post(&priv->devsem);
(void)sem_post(&priv->devsem);
}
/****************************************************************************
@@ -354,27 +350,16 @@ static int cc3000_wait(FAR struct cc3000_dev_s *priv, sem_t *psem)
/* Wait on first psem to become signaled */
ret = sem_wait(psem);
if (ret >= 0)
{
/* Yes... then retake the mutual exclusion semaphore */
ret = cc3000_devtake(priv);
}
sched_unlock();
/* Was the semaphore wait successful? Did we successful re-take the
* mutual exclusion semaphore?
*/
if (ret < 0)
{
/* No.. One of the two sem_wait's failed. */
ret = -errno;
return -errno;
}
return ret;
/* Then retake the mutual exclusion semaphore */
cc3000_devtake(priv);
sched_unlock();
return OK;
}
/****************************************************************************
@@ -820,11 +805,7 @@ static int cc3000_open(FAR struct file *filep)
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
return -ret;
}
cc3000_devtake(priv);
/* Increment the reference count */
@@ -986,9 +967,8 @@ out_with_sem:
static int cc3000_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct inode *inode;
FAR struct cc3000_dev_s *priv;
int ret;
#ifdef CONFIG_CC3000_MT
int s;
#endif
@@ -1005,11 +985,7 @@ static int cc3000_close(FAR struct file *filep)
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
return -EINTR;
}
cc3000_devtake(priv);
/* Decrement the reference count unless it would decrement a negative
* value. When the count decrements to zero, there are no further
@@ -1086,13 +1062,7 @@ static ssize_t cc3000_read(FAR struct file *filep, FAR char *buffer, size_t len)
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
nread = -errno;
goto errout_without_sem;
}
cc3000_devtake(priv);
/* Verify that the caller has provided a buffer large enough to receive
* the maximum data.
@@ -1152,7 +1122,7 @@ static ssize_t cc3000_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
/* Yes... then retake the mutual exclusion semaphore */
ret = cc3000_devtake(priv);
cc3000_devtake(priv);
}
/* Was the semaphore wait successful? Did we successful re-take the
@@ -1239,15 +1209,7 @@ static ssize_t cc3000_write(FAR struct file *filep, FAR const char *usrbuffer, s
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
ndbg("sem_wait: %d\n", errno);
nwritten = -errno;
goto errout_without_sem;
}
cc3000_devtake(priv);
/* Figure out the total length of the packet in order to figure out if there is padding or not */
@@ -1352,13 +1314,7 @@ static int cc3000_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
return -errno;
}
cc3000_devtake(priv);
/* Process the IOCTL by command */
@@ -1463,13 +1419,7 @@ static int cc3000_poll(FAR struct file *filep, FAR struct pollfd *fds,
/* Are we setting up the poll? Or tearing it down? */
ret = cc3000_devtake(priv);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
return -errno;
}
cc3000_devtake(priv);
if (setup)
{