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| author | Nicolas Frayer <nfrayer@baylibre.com> | 2022-12-30 01:14:04 +0100 |
|---|---|---|
| committer | Nishanth Menon <nm@ti.com> | 2023-03-08 08:06:30 +0100 |
| commit | 5f1732a8683c1da8faaa90d6ffc3bd6d33013a58 (patch) | |
| tree | fcc874cf0c1d13e05b1be5e0fa9573c9a3c19c2d /drivers/soc/ti/k3-ringacc.c | |
| parent | Linux 6.3-rc1 (diff) | |
| download | linux-5f1732a8683c1da8faaa90d6ffc3bd6d33013a58.tar.xz linux-5f1732a8683c1da8faaa90d6ffc3bd6d33013a58.zip | |
soc: ti: k3-ringacc: Add try_module_get() to k3_dmaring_request_dual_ring()
When the k3 ring accelerator driver has been modified to add module build
support, try_module_get() and module_put() have been added to update the
module refcnt. One code path has not been updated and it has introduced
an issue where the refcnt is decremented by module_put() in
k3_ringacc_ring_free() without being incremented previously.
Adding try_module_get() to k3_dmaring_request_dual_ring() ensures the
refcnt is kept up to date.
Fixes: c07f216a8b72 ("soc: ti: k3-ringacc: Allow the driver to be built as module")
Signed-off-by: Nicolas Frayer <nfrayer@baylibre.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20221230001404.10902-1-nfrayer@baylibre.com
Signed-off-by: Nishanth Menon <nm@ti.com>
Diffstat (limited to 'drivers/soc/ti/k3-ringacc.c')
| -rw-r--r-- | drivers/soc/ti/k3-ringacc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/soc/ti/k3-ringacc.c b/drivers/soc/ti/k3-ringacc.c index e01e4d815230..8f131368a758 100644 --- a/drivers/soc/ti/k3-ringacc.c +++ b/drivers/soc/ti/k3-ringacc.c @@ -406,6 +406,11 @@ static int k3_dmaring_request_dual_ring(struct k3_ringacc *ringacc, int fwd_id, mutex_lock(&ringacc->req_lock); + if (!try_module_get(ringacc->dev->driver->owner)) { + ret = -EINVAL; + goto err_module_get; + } + if (test_bit(fwd_id, ringacc->rings_inuse)) { ret = -EBUSY; goto error; @@ -421,6 +426,8 @@ static int k3_dmaring_request_dual_ring(struct k3_ringacc *ringacc, int fwd_id, return 0; error: + module_put(ringacc->dev->driver->owner); +err_module_get: mutex_unlock(&ringacc->req_lock); return ret; } |