[PATCH 5.15 366/917] ath11k: fix some sleeping in atomic bugs

Greg Kroah-Hartman
2021-11-16T00:54:34Z

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit aadf7c81a0771b8f1c97dabca6a48bae1b387779 ]

The ath11k_dbring_bufs_replenish() and ath11k_dbring_fill_bufs()
take a "gfp" parameter but they since they take spinlocks, the
allocations they do have to be atomic. This causes a bug because
ath11k_dbring_buf_setup passes GFP_KERNEL for the gfp flags.

The fix is to use GFP_ATOMIC and remove the unused parameters.

Fixes: bd6478559e27 ("ath11k: Add direct buffer ring support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210812070434.GE31863@kili
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/ath/ath11k/dbring.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/dbring.c b/drivers/net/wireless/ath/ath11k/dbring.c
index 5e1f5437b4185..fd98ba5b1130b 100644
--- a/drivers/net/wireless/ath/ath11k/dbring.c
+++ b/drivers/net/wireless/ath/ath11k/dbring.c
@@ -8,8 +8,7 @@

static int ath11k_dbring_bufs_replenish(struct ath11k *ar,
struct ath11k_dbring *ring,
- struct ath11k_dbring_element *buff,
- gfp_t gfp)
+ struct ath11k_dbring_element *buff)
{
struct ath11k_base *ab = ar->ab;
struct hal_srng *srng;
@@ -35,7 +34,7 @@ static int ath11k_dbring_bufs_replenish(struct ath11k *ar,
goto err;

spin_lock_bh(&ring->idr_lock);
- buf_id = idr_alloc(&ring->bufs_idr, buff, 0, ring->bufs_max, gfp);
+ buf_id = idr_alloc(&ring->bufs_idr, buff, 0, ring->bufs_max, GFP_ATOMIC);
spin_unlock_bh(&ring->idr_lock);
if (buf_id < 0) {
ret = -ENOBUFS;
@@ -72,8 +71,7 @@ err:
}

static int ath11k_dbring_fill_bufs(struct ath11k *ar,
- struct ath11k_dbring *ring,
- gfp_t gfp)
+ struct ath11k_dbring *ring)
{
struct ath11k_dbring_element *buff;
struct hal_srng *srng;
@@ -92,11 +90,11 @@ static int ath11k_dbring_fill_bufs(struct ath11k *ar,
size = sizeof(*buff) + ring->buf_sz + align - 1;

while (num_remain > 0) {
- buff = kzalloc(size, gfp);
+ buff = kzalloc(size, GFP_ATOMIC);
if (!buff)
break;

- ret = ath11k_dbring_bufs_replenish(ar, ring, buff, gfp);
+ ret = ath11k_dbring_bufs_replenish(ar, ring, buff);
if (ret) {
ath11k_warn(ar->ab, "failed to replenish db ring num_remain %d req_ent %d\n",
num_remain, req_entries);
@@ -176,7 +174,7 @@ int ath11k_dbring_buf_setup(struct ath11k *ar,
ring->hp_addr = ath11k_hal_srng_get_hp_addr(ar->ab, srng);
ring->tp_addr = ath11k_hal_srng_get_tp_addr(ar->ab, srng);

- ret = ath11k_dbring_fill_bufs(ar, ring, GFP_KERNEL);
+ ret = ath11k_dbring_fill_bufs(ar, ring);

return ret;
}
@@ -322,7 +320,7 @@ int ath11k_dbring_buffer_release_event(struct ath11k_base *ab,
}

memset(buff, 0, size);
- ath11k_dbring_bufs_replenish(ar, ring, buff, GFP_ATOMIC);
+ ath11k_dbring_bufs_replenish(ar, ring, buff);
}

spin_unlock_bh(&srng->lock);
--
2.33.0