[PATCH 1/1] fpga: zynqmp-fpga: Correctly handle error pointer

From: Alan Tull
Date: Thu May 30 2019 - 10:56:43 EST


From: Moritz Fischer <mdf@xxxxxxxxxx>

Fixes the following static checker errors:

drivers/fpga/zynqmp-fpga.c:50 zynqmp_fpga_ops_write()
error: 'eemi_ops' dereferencing possible ERR_PTR()

drivers/fpga/zynqmp-fpga.c:84 zynqmp_fpga_ops_state()
error: 'eemi_ops' dereferencing possible ERR_PTR()

Note: This does not handle the EPROBE_DEFER value in a
special manner.

Fixes commit c09f7471127e ("fpga manager: Adding FPGA Manager support for
Xilinx zynqmp")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Moritz Fischer <mdf@xxxxxxxxxx>
Acked-by: Alan Tull <atull@xxxxxxxxxx>
---
drivers/fpga/zynqmp-fpga.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c
index f7cbaadf49ab..b8a88d21d038 100644
--- a/drivers/fpga/zynqmp-fpga.c
+++ b/drivers/fpga/zynqmp-fpga.c
@@ -47,7 +47,7 @@ static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
char *kbuf;
int ret;

- if (!eemi_ops || !eemi_ops->fpga_load)
+ if (IS_ERR_OR_NULL(eemi_ops) || !eemi_ops->fpga_load)
return -ENXIO;

priv = mgr->priv;
@@ -81,7 +81,7 @@ static enum fpga_mgr_states zynqmp_fpga_ops_state(struct fpga_manager *mgr)
const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
u32 status;

- if (!eemi_ops || !eemi_ops->fpga_get_status)
+ if (IS_ERR_OR_NULL(eemi_ops) || !eemi_ops->fpga_get_status)
return FPGA_MGR_STATE_UNKNOWN;

eemi_ops->fpga_get_status(&status);
--
2.21.0