[PATCH 4.4 053/188] pata_octeon_cf: avoid WARN_ON() in ata_host_activate()

Greg Kroah-Hartman
2021-07-19T14:58:33Z

From: Sergey Shtylyov <s.shtylyov@omp.ru>

[ Upstream commit bfc1f378c8953e68ccdbfe0a8c20748427488b80 ]

Iff platform_get_irq() fails (or returns IRQ0) and thus the polling mode
has to be used, ata_host_activate() hits the WARN_ON() due to 'irq_handler'
parameter being non-NULL if the polling mode is selected. Let's only set
the pointer to the driver's IRQ handler if platform_get_irq() returns a
valid IRQ # -- this should avoid the unnecessary WARN_ON()...

Fixes: 43f01da0f279 ("MIPS/OCTEON/ata: Convert pata_octeon_cf.c to use device tree.")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/3a241167-f84d-1d25-5b9b-be910afbe666@omp.ru
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/ata/pata_octeon_cf.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/pata_octeon_cf.c b/drivers/ata/pata_octeon_cf.c
index 27245957eee3..909de33f9158 100644
--- a/drivers/ata/pata_octeon_cf.c
+++ b/drivers/ata/pata_octeon_cf.c
@@ -909,10 +909,11 @@ static int octeon_cf_probe(struct platform_device *pdev)
return -EINVAL;
}

- irq_handler = octeon_cf_interrupt;
i = platform_get_irq(dma_dev, 0);
- if (i > 0)
+ if (i > 0) {
irq = i;
+ irq_handler = octeon_cf_interrupt;
+ }
}
of_node_put(dma_node);
}
--
2.30.2