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IronPort-SDR: MeMq844Z+1AL9vQAX+/l/4fhk+E2EMbP0lQfYIJvVF/eFI0UUgt2s97BjD5ygigJG/kQKsWYyn 2D2/AkVxrXSBC2tAcjSX0PgAHOhDxRVCOVUYKhCvuq6f5qyRYDLlfeOqy9hx4A+dzvCCR48SBu h7N+5BUsWpGonKzMfa4tBFTkfwy5oJ8eHqQr1jFVwsXl3Nfjr9FzdozSWN8ERvyP0D4FpI9dvb 2LLom9kFkH3ocvoe0wfCF/MblTDtGh3yXqF7DFnaQHGYpzcyJ73MqBcaR57FZC2BxwLoe/KrIw 99EjZcYz3qHJ++CoaayZhf8Y X-IronPort-AV: E=Sophos;i="5.85,316,1624345200"; d="scan'208";a="145305449" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa1.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 23 Sep 2021 06:21:22 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.14; Thu, 23 Sep 2021 06:21:21 -0700 Received: from rob-dk-mpu01.microchip.com (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2176.14 via Frontend Transport; Thu, 23 Sep 2021 06:21:19 -0700 From: Claudiu Beznea To: , , , , CC: , , , Claudiu Beznea Subject: [PATCH v4 08/17] clk: at91: clk-master: check if div or pres is zero Date: Thu, 23 Sep 2021 16:20:37 +0300 Message-ID: <20210923132046.1860549-9-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210923132046.1860549-1-claudiu.beznea@microchip.com> References: <20210923132046.1860549-1-claudiu.beznea@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210923_062122_825456_A5492624 X-CRM114-Status: GOOD ( 11.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Check if div or pres is zero before using it as argument for ffs(). In case div is zero ffs() will return 0 and thus substracting from zero will lead to invalid values to be setup in registers. Fixes: 7a110b9107ed8 ("clk: at91: clk-master: re-factor master clock") Fixes: 75c88143f3b87 ("clk: at91: clk-master: add master clock support for SAMA7G5") Signed-off-by: Claudiu Beznea --- drivers/clk/at91/clk-master.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c index 9a2c8e64cacf..2093e13b5068 100644 --- a/drivers/clk/at91/clk-master.c +++ b/drivers/clk/at91/clk-master.c @@ -344,7 +344,7 @@ static int clk_master_pres_set_rate(struct clk_hw *hw, unsigned long rate, else if (pres == 3) pres = MASTER_PRES_MAX; - else + else if (pres) pres = ffs(pres) - 1; spin_lock_irqsave(master->lock, flags); @@ -757,7 +757,7 @@ static int clk_sama7g5_master_set_rate(struct clk_hw *hw, unsigned long rate, if (div == 3) div = MASTER_PRES_MAX; - else + else if (div) div = ffs(div) - 1; spin_lock_irqsave(master->lock, flags);