commit 6acdf7e19b37cb3a9258603d0eab315079c19c5e upstream.

The part_event_bitmap register is 64 bits wide, so read it with ioread64() instead of the 32-bit ioread32().

Fixes: 52eabba5bcdb ("switchtec: Add IOCTLs to the Switchtec driver") Link: https://lore.kernel.org/r/20190910195833.3891-1-logang@deltatee.com Reported-by: Doug Meyer dmeyer@gigaio.com Signed-off-by: Logan Gunthorpe logang@deltatee.com Cc: Bjorn Helgaas bhelgaas@google.com Cc: stable@vger.kernel.org # v4.12+ Cc: Kelvin Cao Kelvin.Cao@microchip.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/switch/switchtec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

v2 of this patch adds the missing header that provides readq() on non-64bit architectures.

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c index e3aefdafae89..0941555b84a5 100644 --- a/drivers/pci/switch/switchtec.c +++ b/drivers/pci/switch/switchtec.c @@ -23,7 +23,7 @@ #include <linux/pci.h> #include <linux/cdev.h> #include <linux/wait.h> - +#include <linux/io-64-nonatomic-lo-hi.h> #include <linux/nospec.h>

MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver"); @@ -898,7 +898,7 @@ static int ioctl_event_summary(struct switchtec_dev *stdev, u32 reg;

s.global = ioread32(&stdev->mmio_sw_event->global_summary); - s.part_bitmap = ioread32(&stdev->mmio_sw_event->part_event_bitmap); + s.part_bitmap = readq(&stdev->mmio_sw_event->part_event_bitmap); s.local_part = ioread32(&stdev->mmio_part_cfg->part_event_summary);

for (i = 0; i < stdev->partition_count; i++) { -- 2.20.1