[PATCH v2] soc: fsl: qe: panic on ioremap() failure in qe_reset()

[Wang Jun]

When ioremap() fails in qe_reset(), the global pointer qe_immr remains
NULL, leading to a subsequent NULL pointer dereference when the pointer
is accessed. Since this happens early in the boot process, a failure to
map a few bytes of I/O memory indicates a fatal error from which the
system cannot recover.

Follow the same pattern as qe_sdma_init() and panic immediately when
ioremap() fails. This avoids a silent NULL pointer dereference later
and makes the error explicit.

Fixes: 986585385131 ("[POWERPC] Add QUICC Engine (QE) infrastructure")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Wang Jun <1742789905@xxxxxx>
---
 drivers/soc/fsl/qe/qe.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index 70b6eddb867b..9f6223043ee3 100644
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -86,8 +86,12 @@ static phys_addr_t get_qe_base(void)
 
 void qe_reset(void)
 {
-	if (qe_immr == NULL)
+	if (qe_immr == NULL) {
 		qe_immr = ioremap(get_qe_base(), QE_IMMAP_SIZE);
+		if (qe_immr == NULL) {
+			panic("QE:ioremap failed!");
+		}
+	}
 
 	qe_snums_init();
 
-- 
2.43.0