[SRU][N:linux-bluefield][PATCH v1 3/4] platform/mellanox: mlxbf-pmc: Validate event/enable input

[Chris Babroski]

From: Shravan Kumar Ramani <shravankr at nvidia.com>

BugLink: https://bugs.launchpad.net/bugs/2121550

Before programming the event info, validate the event number received as input
by checking if it exists in the event_list. Also fix a typo in the comment for
mlxbf_pmc_get_event_name() to correctly mention that it returns the event name
when taking the event number as input, and not the other way round.

Fixes: 423c3361855c ("platform/mellanox: mlxbf-pmc: Add support for BlueField-3")
Signed-off-by: Shravan Kumar Ramani <shravankr at nvidia.com>
Reviewed-by: David Thompson <davthompson at nvidia.com>
Link: https://lore.kernel.org/r/2ee618c59976bcf1379d5ddce2fc60ab5014b3a9.1751380187.git.shravankr@nvidia.com
[ij: split kstrbool() change to own commit.]
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen at linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen at linux.intel.com>
(cherry picked from commit f8c1311769d3b2c82688b294b4ae03e94f1c326d)
Signed-off-by: Chris Babroski <cbabroski at nvidia.com>
---
 drivers/platform/mellanox/mlxbf-pmc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
index 2b692a76398e..c654b4bf141f 100644
--- a/drivers/platform/mellanox/mlxbf-pmc.c
+++ b/drivers/platform/mellanox/mlxbf-pmc.c
@@ -1223,7 +1223,7 @@ static int mlxbf_pmc_get_event_num(const char *blk, const char *evt)
 	return -ENODEV;
 }
 
-/* Get the event number given the name */
+/* Get the event name given the number */
 static char *mlxbf_pmc_get_event_name(const char *blk, u32 evt)
 {
 	const struct mlxbf_pmc_events *events;
@@ -1807,6 +1807,9 @@ static ssize_t mlxbf_pmc_event_store(struct device *dev,
 		err = kstrtouint(buf, 0, &evt_num);
 		if (err < 0)
 			return err;
+
+		if (!mlxbf_pmc_get_event_name(pmc->block_name[blk_num], evt_num))
+			return -EINVAL;
 	}
 
 	if (strstr(pmc->block_name[blk_num], "l3cache"))
-- 
2.34.1