[PATCH 5.11 506/601] powerpc/xive: Drop check on irq_data in xive_core_debug_show()

Greg Kroah-Hartman
2021-05-12T17:56:31Z

From: Cédric Le Goater <clg@kaod.org>

[ Upstream commit a74ce5926b20cd0e6d624a9b2527073a96dfed7f ]

When looping on IRQ descriptor, irq_data is always valid.

Fixes: 930914b7d528 ("powerpc/xive: Add a debugfs file to dump internal XIVE state")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210331144514.892250-6-clg@kaod.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/sysdev/xive/common.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c
index 595310e056f4..6e43bba80707 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -1599,6 +1599,8 @@ static void xive_debug_show_irq(struct seq_file *m, u32 hw_irq, struct irq_data
u32 target;
u8 prio;
u32 lirq;
+ struct xive_irq_data *xd;
+ u64 val;

if (!is_xive_irq(chip))
return;
@@ -1612,17 +1614,14 @@ static void xive_debug_show_irq(struct seq_file *m, u32 hw_irq, struct irq_data
seq_printf(m, "IRQ 0x%08x : target=0x%x prio=%02x lirq=0x%x ",
hw_irq, target, prio, lirq);

- if (d) {
- struct xive_irq_data *xd = irq_data_get_irq_handler_data(d);
- u64 val = xive_esb_read(xd, XIVE_ESB_GET);
-
- seq_printf(m, "flags=%c%c%c PQ=%c%c",
- xd->flags & XIVE_IRQ_FLAG_STORE_EOI ? 'S' : ' ',
- xd->flags & XIVE_IRQ_FLAG_LSI ? 'L' : ' ',
- xd->flags & XIVE_IRQ_FLAG_H_INT_ESB ? 'H' : ' ',
- val & XIVE_ESB_VAL_P ? 'P' : '-',
- val & XIVE_ESB_VAL_Q ? 'Q' : '-');
- }
+ xd = irq_data_get_irq_handler_data(d);
+ val = xive_esb_read(xd, XIVE_ESB_GET);
+ seq_printf(m, "flags=%c%c%c PQ=%c%c",
+ xd->flags & XIVE_IRQ_FLAG_STORE_EOI ? 'S' : ' ',
+ xd->flags & XIVE_IRQ_FLAG_LSI ? 'L' : ' ',
+ xd->flags & XIVE_IRQ_FLAG_H_INT_ESB ? 'H' : ' ',
+ val & XIVE_ESB_VAL_P ? 'P' : '-',
+ val & XIVE_ESB_VAL_Q ? 'Q' : '-');
seq_puts(m, "\n");
}

--
2.30.2