PCI/switchtec: Fix vep_vector_number ioread width

commit 9375646b4cf03aee81bc6c305aa18cc80b682796 upstream.

vep_vector_number is actually a 16 bit register which should be read with
ioread16() instead of ioread32().

Fixes: 080b47def5e5 ("MicroSemi Switchtec management interface driver")
Link: https://lore.kernel.org/r/20200106190337.2428-3-logang@deltatee.com
Reported-by: Doug Meyer <dmeyer@gigaio.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index 73dba2739849b08218996a7b759412cf9c3da693..bf229b442e723745d35d355212bca36a4cafdeab 100644 (file)
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -1399,7 +1399,7 @@ static int switchtec_init_isr(struct switchtec_dev *stdev)
        if (nvecs < 0)
                return nvecs;
 
-       event_irq = ioread32(&stdev->mmio_part_cfg->vep_vector_number);
+       event_irq = ioread16(&stdev->mmio_part_cfg->vep_vector_number);
        if (event_irq < 0 || event_irq >= nvecs)
                return -EFAULT;