[PATCH] soc: fsl: dpio: avoid stack usage warning

[Arnd Bergmann]

A 1024 byte variable on the stack will warn on any 32-bit architecture
during compile-testing, and is generally a bad idea anyway:

fsl/dpio/dpio-service.c: In function 
'dpaa2_io_service_enqueue_multiple_desc_fq':
fsl/dpio/dpio-service.c:495:1: error: the frame size of 1032 bytes is larger 
than 1024 bytes [-Werror=frame-larger-than=]

There are currently no callers of this function, so I cannot tell whether
dynamic memory allocation is allowed once callers are added. Change
it to kcalloc for now, if anyone gets a warning about calling this in
atomic context after they start using it, they can fix it later.

Fixes: 9d98809711ae ("soc: fsl: dpio: Adding QMAN multiple enqueue interface")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/soc/fsl/dpio/dpio-service.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/fsl/dpio/dpio-service.c 
b/drivers/soc/fsl/dpio/dpio-service.c
index cd4f6410e8c2..ff0ef8cbdbff 100644
--- a/drivers/soc/fsl/dpio/dpio-service.c
+++ b/drivers/soc/fsl/dpio/dpio-service.c
@@ -478,12 +478,17 @@ int dpaa2_io_service_enqueue_multiple_desc_fq(struct 
dpaa2_io *d,
                                const struct dpaa2_fd *fd,
                                int nb)
 {
-       int i;
-       struct qbman_eq_desc ed[32];
+       struct qbman_eq_desc *ed = kcalloc(sizeof(struct qbman_eq_desc), 32, 
GFP_KERNEL);
+       int i, ret;
+
+       if (!ed)
+               return -ENOMEM;
 
        d = service_select(d);
-       if (!d)
-               return -ENODEV;
+       if (!d) {
+               ret = -ENODEV;
+               goto out;
+       }
 
        for (i = 0; i < nb; i++) {
                qbman_eq_desc_clear(&ed[i]);
@@ -491,7 +496,10 @@ int dpaa2_io_service_enqueue_multiple_desc_fq(struct 
dpaa2_io *d,
                qbman_eq_desc_set_fq(&ed[i], fqid[i]);
        }
 
-       return qbman_swp_enqueue_multiple_desc(d->swp, &ed[0], fd, nb);
+       ret = qbman_swp_enqueue_multiple_desc(d->swp, &ed[0], fd, nb);
+out:
+       kfree(ed);
+       return ret;
 }
 EXPORT_SYMBOL(dpaa2_io_service_enqueue_multiple_desc_fq);
 
-- 
2.26.0