linux-kernel - [PATCH v3] staging: kpc2000: remove unnecessary assertions in kpc_dma

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Message-Id: <20191219172118.17456-1-pakki001@umn.edu>
Date:   Thu, 19 Dec 2019 11:21:11 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vandana BN <bnvandana@...il.com>,
        Simon Sandström <simon@...anor.nu>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Madhumitha Prabakaran <madhumithabiw@...il.com>,
        Matt Sickler <Matt.Sickler@...tronics.com>,
        Jeremy Sowden <jeremy@...zel.net>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3] staging: kpc2000: remove unnecessary assertions in kpc_dma_transfer

In kpc_dma_transfer(), the assertion that priv is NULL and priv->ldev
is NULL, are never satisfied. The two callers of the function,
dereference the fields before the function is called. This patch
removes the two BUG_ON calls.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
v2: Also remove BUG_ON call for ldev, suggested by Greg.

v1: Replace the recovery code by removing the assertion, as suggested
by Greg Kroah-Hartman.
---
 drivers/staging/kpc2000/kpc_dma/fileops.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/staging/kpc2000/kpc_dma/fileops.c b/drivers/staging/kpc2000/kpc_dma/fileops.c
index cb52bd9a6d2f..40525540dde6 100644
--- a/drivers/staging/kpc2000/kpc_dma/fileops.c
+++ b/drivers/staging/kpc2000/kpc_dma/fileops.c
@@ -49,9 +49,7 @@ static int kpc_dma_transfer(struct dev_private_data *priv,
 	u64 dma_addr;
 	u64 user_ctl;
 
-	BUG_ON(priv == NULL);
 	ldev = priv->ldev;
-	BUG_ON(ldev == NULL);
 
 	acd = kzalloc(sizeof(*acd), GFP_KERNEL);
 	if (!acd) {
-- 
2.20.1