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| author | Olof Johansson <olof@lixom.net> | 2017-06-18 21:01:15 -0700 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2017-06-18 21:01:15 -0700 |
| commit | 43e68aa7b58f0f2d9abb79ca03c397f4f00d9238 (patch) | |
| tree | 1b7b6c107b5afe73088bda4e8bf4687ad9015bed /drivers/firmware | |
| parent | f39b24e0b4d812da9658033621d3992959ae6d32 (diff) | |
| parent | cd307124ad9bb01019920c2053696218d161f4a1 (diff) | |
| download | linux-stable-43e68aa7b58f0f2d9abb79ca03c397f4f00d9238.tar.gz linux-stable-43e68aa7b58f0f2d9abb79ca03c397f4f00d9238.tar.bz2 linux-stable-43e68aa7b58f0f2d9abb79ca03c397f4f00d9238.zip | |
Merge tag 'tegra-for-4.13-firmware' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/drivers
firmware: tegra: Changes for v4.13-rc1
This contains a fix for missing semaphore release in error paths as well
as a bogus error code return in the BPMP firmware implementation.
* tag 'tegra-for-4.13-firmware' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
firmware: tegra: Fix locking bugs in BPMP
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/tegra/bpmp.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c index f11c7025b4a1..b25179517cc5 100644 --- a/drivers/firmware/tegra/bpmp.c +++ b/drivers/firmware/tegra/bpmp.c @@ -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, |