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firmware: tegra: Fix locking bugs in BPMP 

There are a bunch of error paths were we don't unlock the bpmp->threaded
lock.  Also if __tegra_bpmp_channel_write() fails then we returned
success instead of an error code.

Fixes: 983de5f971 ("firmware: tegra: Add BPMP support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dan Carpenter 2017-05-05 08:37:23 +03:00 committed by Thierry Reding
parent 2ea659a9ef
commit cd307124ad
1 changed files with 18 additions and 10 deletions
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28
drivers/firmware/tegra/bpmp.c
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@ -211,14 +211,17 @@ static ssize_t tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel,
int index;
index = tegra_bpmp_channel_get_thread_index(channel);
if (index < 0)
return index;
if (index < 0) {
err = index;
goto unlock;
}
spin_lock_irqsave(&bpmp->lock, flags);
err = __tegra_bpmp_channel_read(channel, data, size);
clear_bit(index, bpmp->threaded.allocated);
spin_unlock_irqrestore(&bpmp->lock, flags);
unlock:
up(&bpmp->threaded.lock);
return err;
@ -256,18 +259,18 @@ tegra_bpmp_write_threaded(struct tegra_bpmp *bpmp, unsigned int mrq,
index = find_first_zero_bit(bpmp->threaded.allocated, count);
if (index == count) {
channel = ERR_PTR(-EBUSY);
err = -EBUSY;
goto unlock;
}
channel = tegra_bpmp_channel_get_thread(bpmp, index);
if (!channel) {
channel = ERR_PTR(-EINVAL);
err = -EINVAL;
goto unlock;
}
if (!tegra_bpmp_master_free(channel)) {
channel = ERR_PTR(-EBUSY);
err = -EBUSY;
goto unlock;
}
@ -275,16 +278,21 @@ tegra_bpmp_write_threaded(struct tegra_bpmp *bpmp, unsigned int mrq,
err = __tegra_bpmp_channel_write(channel, mrq, MSG_ACK | MSG_RING,
data, size);
if (err < 0) {
clear_bit(index, bpmp->threaded.allocated);
goto unlock;
}
if (err < 0)
goto clear_allocated;
set_bit(index, bpmp->threaded.busy);
unlock:
spin_unlock_irqrestore(&bpmp->lock, flags);
return channel;
clear_allocated:
clear_bit(index, bpmp->threaded.allocated);
unlock:
spin_unlock_irqrestore(&bpmp->lock, flags);
up(&bpmp->threaded.lock);
return ERR_PTR(err);
}
static ssize_t tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,