clocksource/drivers/timer-of: Check return value of of_iomap in timer_of_base_init()

[ Upstream commit 4467b8bad2401794fb89a0268c8c8257180bf60f ]

of_base->base can either be iomapped using of_io_request_and_map() or
of_iomap() depending whether or not an of_base->name has been set.

Thus check of_base->base against NULL as of_iomap() does not return a
PTR_ERR() in case of error.

Fixes: 9aea417afa6b ("clocksource/drivers/timer-of: Don't request the resource by name")
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Link: https://lore.kernel.org/r/20220307172656.4836-1-granquet@baylibre.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c
index 529cc6a51cdb3bf842d30ba693ae20ca9df5ec65..c3f54d9912be7955ecf130c804bd20de29eda339 100644 (file)
--- a/drivers/clocksource/timer-of.c
+++ b/drivers/clocksource/timer-of.c
@@ -157,9 +157,9 @@ static __init int timer_of_base_init(struct device_node *np,
        of_base->base = of_base->name ?
                of_io_request_and_map(np, of_base->index, of_base->name) :
                of_iomap(np, of_base->index);
-       if (IS_ERR(of_base->base)) {
-               pr_err("Failed to iomap (%s)\n", of_base->name);
-               return PTR_ERR(of_base->base);
+       if (IS_ERR_OR_NULL(of_base->base)) {
+               pr_err("Failed to iomap (%s:%s)\n", np->name, of_base->name);
+               return of_base->base ? PTR_ERR(of_base->base) : -ENOMEM;
        }
 
        return 0;