irqchip/gic-v4.1: Use readx_poll_timeout_atomic() to fix sleep in atomic

readx_poll_timeout() can sleep if @sleep_us is specified by the caller,
and is therefore unsafe to be used inside the atomic context, which is
this case when we use it to poll the GICR_VPENDBASER.Dirty bit in
irq_set_vcpu_affinity() callback.

Let's convert to its atomic version instead which helps to get the v4.1
board back to life!

Fixes: 96806229ca03 ("irqchip/gic-v4.1: Add support for VPENDBASER's Dirty+Valid signaling")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200605052345.1494-1-yuzenghui@huawei.com

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index cd685f5..6a5a87f 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3797,10 +3797,10 @@ static void its_wait_vpt_parse_complete(void)
        if (!gic_rdists->has_vpend_valid_dirty)
                return;
 
-       WARN_ON_ONCE(readq_relaxed_poll_timeout(vlpi_base + GICR_VPENDBASER,
-                                               val,
-                                               !(val & GICR_VPENDBASER_Dirty),
-                                               10, 500));
+       WARN_ON_ONCE(readq_relaxed_poll_timeout_atomic(vlpi_base + GICR_VPENDBASER,
+                                                      val,
+                                                      !(val & GICR_VPENDBASER_Dirty),
+                                                      10, 500));
 }
 
 static void its_vpe_schedule(struct its_vpe *vpe)