[PATCH net v3 3/3] pds_core: check info_regs in the identity debugfs reader

["Nikhil P. Rao" <nikhil.rao@amd.com>]

identity_show() reads fw_heartbeat from info_regs with no NULL check,
unlike every other reader of that register. pdsc_unmap_bars() sets
info_regs to NULL on reset and on remove, and the identity file survives
a reset.

Fixes: e96094c1d11c ("pds_core: Clear BARs on reset")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Closes: https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260804235946.177762-1-nikhil.rao%40amd.com
Assisted-by: Claude:claude-opus-4.8
Signed-off-by: Nikhil P. Rao <nikhil.rao@amd.com>
---
 drivers/net/ethernet/amd/pds_core/debugfs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amd/pds_core/debugfs.c b/drivers/net/ethernet/amd/pds_core/debugfs.c
index ef0a1b7d159b..c458e6758959 100644
--- a/drivers/net/ethernet/amd/pds_core/debugfs.c
+++ b/drivers/net/ethernet/amd/pds_core/debugfs.c
@@ -38,8 +38,9 @@ static int identity_show(struct seq_file *seq, void *v)
 
 	ident = &pdsc->dev_ident;
 
-	seq_printf(seq, "fw_heartbeat:     0x%x\n",
-		   ioread32(&pdsc->info_regs->fw_heartbeat));
+	if (pdsc->info_regs)
+		seq_printf(seq, "fw_heartbeat:     0x%x\n",
+			   ioread32(&pdsc->info_regs->fw_heartbeat));
 
 	seq_printf(seq, "nlifs:            %d\n",
 		   le32_to_cpu(ident->nlifs));
-- 
2.43.0