From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7DC9E257AC3; Thu, 17 Apr 2025 18:24:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744914292; cv=none; b=qqfqRHRV2vPk9tKSx7m9Gqhv9Ip/5JNm4yel9/DxlANcSAg3QIp6n3XGYcq/Qsmv4AEIB93yWPJ23KUL4X3Ol43ovSWc2EC69GwHYubyn4YjjUUKe7m6qUVGPtL5zTRa3xT5WzseTUrkfFrh5o9ICKfbVCVXhSRY6YoH1BIGE+0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744914292; c=relaxed/simple; bh=nVZsMctnSlNnPRS9/4IUrz+xwj6nFJ5Zkpl68LSBewQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=k7Xo26Xmsh24u1VNRSEuOC7r8EUyfouxMA3ucbrRG854gVdP1efH1fvg+zYZJPOyKKEhmOiZIdyMzDZJQ49SF+zr7lbPrV6DHzxnQV6Jr8E83HzrtBPFotB0uDa2g2L0i5SePoUYiHms1LCtjq7SqHacEMj/xeSl+89L0jVyZr4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SY1YqEyP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="SY1YqEyP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8FEECC4CEEA; Thu, 17 Apr 2025 18:24:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744914291; bh=nVZsMctnSlNnPRS9/4IUrz+xwj6nFJ5Zkpl68LSBewQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SY1YqEyP0/SvcAHlR3k6yUjwvNORRlTTwGw+duXOIMNcxDDtUawJSG70nu1754AvG H7gO3fv9VVJxzBLhqSQXuj0ZUae4h9ZxUdHdv2PK+7K6JFuo6QaJPtnzyXJgEQbiqQ XFCMLQvMuyNswoRGNS2rm996VX4SIa7k1WwYyYXo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Sasha Levin Subject: [PATCH 6.13 168/414] pwm: fsl-ftm: Handle clk_get_rate() returning 0 Date: Thu, 17 Apr 2025 19:48:46 +0200 Message-ID: <20250417175118.195581405@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250417175111.386381660@linuxfoundation.org> References: <20250417175111.386381660@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Uwe Kleine-König [ Upstream commit 928446a5302eee30ebb32075c0db5dda5a138fb7 ] Considering that the driver doesn't enable the used clocks (and also that clk_get_rate() returns 0 if CONFIG_HAVE_CLK is unset) better check the return value of clk_get_rate() for being non-zero before dividing by it. Fixes: 3479bbd1e1f8 ("pwm: fsl-ftm: More relaxed permissions for updating period") Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/b68351a51017035651bc62ad3146afcb706874f0.1743501688.git.u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König Signed-off-by: Sasha Levin --- drivers/pwm/pwm-fsl-ftm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c index 2510c10ca4730..c45a5fca4cbbd 100644 --- a/drivers/pwm/pwm-fsl-ftm.c +++ b/drivers/pwm/pwm-fsl-ftm.c @@ -118,6 +118,9 @@ static unsigned int fsl_pwm_ticks_to_ns(struct fsl_pwm_chip *fpc, unsigned long long exval; rate = clk_get_rate(fpc->clk[fpc->period.clk_select]); + if (rate >> fpc->period.clk_ps == 0) + return 0; + exval = ticks; exval *= 1000000000UL; do_div(exval, rate >> fpc->period.clk_ps); @@ -190,6 +193,9 @@ static unsigned int fsl_pwm_calculate_duty(struct fsl_pwm_chip *fpc, unsigned int period = fpc->period.mod_period + 1; unsigned int period_ns = fsl_pwm_ticks_to_ns(fpc, period); + if (!period_ns) + return 0; + duty = (unsigned long long)duty_ns * period; do_div(duty, period_ns); -- 2.39.5