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icnss2: Avoid race between soc wake release threads

Browse source 
Avoid race condition between soc wake release from queue
context and host driver context.

Change-Id: I6e20a9a8781f65447e89160ff4e362a04ec4ec5c
Signed-off-by: Naman Padhiar <npadhiar@codeaurora.org>
This commit is contained in:
Naman Padhiar 2020-11-17 16:00:54 +05:30 • committed by Gerrit - the friendly Code Review server
commit 599bec2e07
1 changed files with 17 additions and 6 deletions
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23
drivers/soc/qcom/icnss2/main.c
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@ -986,6 +986,19 @@ static int icnss_qdss_trace_save_hdlr(struct icnss_priv *priv,
return ret;
}
static inline int icnss_atomic_dec_if_greater_one(atomic_t *v)
{
int dec, c = atomic_read(v);
do {
dec = c - 1;
if (unlikely(dec < 1))
break;
} while (!atomic_try_cmpxchg(v, &c, dec));
return dec;
}
static int icnss_event_soc_wake_request(struct icnss_priv *priv, void *data)
{
int ret = 0;
@ -2365,7 +2378,6 @@ EXPORT_SYMBOL(icnss_force_wake_request);
int icnss_force_wake_release(struct device *dev)
{
struct icnss_priv *priv = dev_get_drvdata(dev);
int count = 0;
if (!dev)
return -ENODEV;
@ -2375,15 +2387,14 @@ int icnss_force_wake_release(struct device *dev)
return -EINVAL;
}
if (atomic_read(&priv->soc_wake_ref_count) > 1) {
count = atomic_dec_return(&priv->soc_wake_ref_count);
icnss_pr_dbg("Calling SOC Wake response");
if (icnss_atomic_dec_if_greater_one(&priv->soc_wake_ref_count)) {
icnss_pr_dbg("SOC previous release pending, Ref count: %d",
count);
atomic_read(&priv->soc_wake_ref_count));
return 0;
}
icnss_pr_dbg("Calling SOC Wake response");
icnss_soc_wake_event_post(priv, ICNSS_SOC_WAKE_RELEASE_EVENT,
0, NULL);