[PATCH][next] soc: fsl: dpio: fix dereference of pointer p before null check

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

Pointer p is currently being dereferenced before it is null
checked on a memory allocation failure check. Fix this by
checking if p is null before dereferencing it.

Addresses-Coverity: ("Dereference before null check")
Fixes: 3b2abda7d28c ("soc: fsl: dpio: Replace QMAN array mode with ring mode 
enqueue")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/soc/fsl/dpio/qbman-portal.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/fsl/dpio/qbman-portal.c 
b/drivers/soc/fsl/dpio/qbman-portal.c
index 740ee0d19582..d1f49caa5b13 100644
--- a/drivers/soc/fsl/dpio/qbman-portal.c
+++ b/drivers/soc/fsl/dpio/qbman-portal.c
@@ -249,10 +249,11 @@ struct qbman_swp *qbman_swp_init(const struct 
qbman_swp_desc *d)
        u32 mask_size;
        u32 eqcr_pi;
 
-       spin_lock_init(&p->access_spinlock);
-
        if (!p)
                return NULL;
+
+       spin_lock_init(&p->access_spinlock);
+
        p->desc = d;
        p->mc.valid_bit = QB_VALID_BIT;
        p->sdq = 0;
-- 
2.25.0