linux-kernel - [PATCH v2] fpga: zynqmp-fpga: Correctly handle error pointer

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Date:   Tue,  7 May 2019 12:43:13 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     linux-fpga@...r.kernel.org
Cc:     atull@...nel.org, linux-kernel@...r.kernel.org,
        michal.simek@...inx.com, linux-arm-kernel@...ts.infradead.org,
        Moritz Fischer <mdf@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH v2] fpga: zynqmp-fpga: Correctly handle error pointer

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@...cle.com>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
---

Changes from v1:
- Address Alan's feedback regarding handling both occurences.

---
 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