linux-kernel - [PATCH 5.10 1/1] usb: musb: core: drop redundant checks

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Date:   Tue, 14 Mar 2023 17:01:13 +0000
From:   Danila Chernetsov <listdansp@...l.ru>
To:     stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Danila Chernetsov <listdansp@...l.ru>, Bin Liu <b-liu@...com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org, Sergey Shtylyov <s.shtylyov@....ru>
Subject: [PATCH 5.10 1/1] usb: musb: core: drop redundant checks

From: Sergey Shtylyov <s.shtylyov@....ru>

commit b0ec7e55fce65f125bd1d7f02e2dc4de62abee34 upstream. 

In musb_{save|restore}_context() the expression '&musb->endpoints[i]' just
cannot be NULL, so the checks have no sense at all -- after dropping them,
the local variables 'hw_ep' are no longer necessary, so drop them as well.

Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.

Signed-off-by: Sergey Shtylyov <s.shtylyov@....ru>
Link: https://lore.kernel.org/r/3f8f60d9-f1b5-6b2c-1222-39b156151a22@omp.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Danila Chernetsov <listdansp@...l.ru>
---
 drivers/usb/musb/musb_core.c | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 4c8f0112481f..605f5cc0f18b 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2673,13 +2673,7 @@ static void musb_save_context(struct musb *musb)
 	musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
 
 	for (i = 0; i < musb->config->num_eps; ++i) {
-		struct musb_hw_ep	*hw_ep;
-
-		hw_ep = &musb->endpoints[i];
-		if (!hw_ep)
-			continue;
-
-		epio = hw_ep->regs;
+		epio = musb->endpoints[i].regs;
 		if (!epio)
 			continue;
 
@@ -2754,13 +2748,7 @@ static void musb_restore_context(struct musb *musb)
 		musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
 
 	for (i = 0; i < musb->config->num_eps; ++i) {
-		struct musb_hw_ep	*hw_ep;
-
-		hw_ep = &musb->endpoints[i];
-		if (!hw_ep)
-			continue;
-
-		epio = hw_ep->regs;
+		epio = musb->endpoints[i].regs;
 		if (!epio)
 			continue;
 
-- 
2.25.1