linux-kernel - [PATCH] fpga: machxo2-spi: return an error on failure

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Date:   Tue, 10 Aug 2021 09:40:36 -0700
From:   trix@...hat.com
To:     mdf@...nel.org, p.pisati@...il.com, atull@...nel.org,
        gregkh@...uxfoundation.org
Cc:     linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] fpga: machxo2-spi: return an error on failure

From: Tom Rix <trix@...hat.com>

Reported problem

	drivers/fpga/machxo2-spi.c:229 machxo2_write_init()
	warn: missing error code 'ret'

	drivers/fpga/machxo2-spi.c:316 machxo2_write_complete()
	warn: missing error code 'ret'

Earlier successes leave 'ret' in a non error state, so these errors are
not reported.  So set ret to -EINVAL before going to the error handler.

Fixes: 88fb3a002330 ("fpga: lattice machxo2: Add Lattice MachXO2 support")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/fpga/machxo2-spi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/fpga/machxo2-spi.c b/drivers/fpga/machxo2-spi.c
index 1afb41aa20d71..b4a530a31302f 100644
--- a/drivers/fpga/machxo2-spi.c
+++ b/drivers/fpga/machxo2-spi.c
@@ -225,8 +225,10 @@ static int machxo2_write_init(struct fpga_manager *mgr,
 		goto fail;
 
 	get_status(spi, &status);
-	if (test_bit(FAIL, &status))
+	if (test_bit(FAIL, &status)) {
+		ret = -EINVAL;
 		goto fail;
+	}
 	dump_status_reg(&status);
 
 	spi_message_init(&msg);
@@ -313,6 +315,7 @@ static int machxo2_write_complete(struct fpga_manager *mgr,
 	dump_status_reg(&status);
 	if (!test_bit(DONE, &status)) {
 		machxo2_cleanup(mgr);
+		ret = -EINVAL;
 		goto fail;
 	}
 
-- 
2.26.3