From: Marc Zyngier maz@kernel.org
commit 0df6664531a12cdd8fc873f0cac0dcb40243d3e9 upstream.
It turns out that our polling of RWP is totally wrong when checking for it in the redistributors, as we test the *distributor* bit index, whereas it is a different bit number in the RDs... Oopsie boo.
This is embarassing. Not only because it is wrong, but also because it took *8 years* to notice the blunder...
Just fix the damn thing.
Fixes: 021f653791ad ("irqchip: gic-v3: Initial support for GICv3") Signed-off-by: Marc Zyngier maz@kernel.org Cc: stable@vger.kernel.org Reviewed-by: Andre Przywara andre.przywara@arm.com Reviewed-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Link: https://lore.kernel.org/r/20220315165034.794482-2-maz@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/irqchip/irq-gic-v3.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -162,11 +162,11 @@ static inline void __iomem *gic_dist_bas } }
-static void gic_do_wait_for_rwp(void __iomem *base) +static void gic_do_wait_for_rwp(void __iomem *base, u32 bit) { u32 count = 1000000; /* 1s! */
- while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) { + while (readl_relaxed(base + GICD_CTLR) & bit) { count--; if (!count) { pr_err_ratelimited("RWP timeout, gone fishing\n"); @@ -180,13 +180,13 @@ static void gic_do_wait_for_rwp(void __i /* Wait for completion of a distributor change */ static void gic_dist_wait_for_rwp(void) { - gic_do_wait_for_rwp(gic_data.dist_base); + gic_do_wait_for_rwp(gic_data.dist_base, GICD_CTLR_RWP); }
/* Wait for completion of a redistributor change */ static void gic_redist_wait_for_rwp(void) { - gic_do_wait_for_rwp(gic_data_rdist_rd_base()); + gic_do_wait_for_rwp(gic_data_rdist_rd_base(), GICR_CTLR_RWP); }
#ifdef CONFIG_ARM64