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 DAC9F20F090; Tue, 17 Jun 2025 15:39:06 +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=1750174746; cv=none; b=Q7iht3zAXmxg9ks7NjYVUCTVoBtVMNVsf66244uxz2yFMBoz5H60wSyjboXwgUUR2bmInpItSb03l8Sn9Oyy+i94Vgo8GJBQv0MUTe9qASAny9R92gd7ARw/jJ/YJYQUkLcWsDwBoO6r8DswOTcU9hERkctsk7A8pcbOjkliFQs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750174746; c=relaxed/simple; bh=JfUvE6FFEpIInQlwSEx4iQ/GVrmBkkbnrQ80hwNlzTw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SUrZ8h/Y7ceJBk9TtRX05Cg/1pN1vcQ9dER8D6hTY11vjbLmjH5VEH6+wW8B4LTycQwkN5Qtk6An/YQtN715FRs4C1kHUMgvArKMyCmiOGguLFouPzkpeI8yGH1QEQHCv86hcue1FB7UYjVjCtzzHoOOuE1R8IYIVM250UzjGF8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ahswMYCa; 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="ahswMYCa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 221CBC4CEE3; Tue, 17 Jun 2025 15:39:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750174746; bh=JfUvE6FFEpIInQlwSEx4iQ/GVrmBkkbnrQ80hwNlzTw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ahswMYCazX9CiqCEk3WXcPKY4oBtSrOLB3jzTNpeWx2mWVUkCNnNY74tJEF45xsAl x7dZreADAHXmZxkjI1TnnT70Zsb3ZF97lLXfQRzeFLSISwyX7tO7MOO4BK8GFVVlQx ApSUtZTxBBdVcrGbb5ZLxtgnz8+CsxXN3dguvRCk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Geert Uytterhoeven , Mark Brown , Sasha Levin Subject: [PATCH 6.12 056/512] spi: sh-msiof: Fix maximum DMA transfer size Date: Tue, 17 Jun 2025 17:20:22 +0200 Message-ID: <20250617152421.809539548@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250617152419.512865572@linuxfoundation.org> References: <20250617152419.512865572@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Geert Uytterhoeven [ Upstream commit 0941d5166629cb766000530945e54b4e49680c68 ] The maximum amount of data to transfer in a single DMA request is calculated from the FIFO sizes (which is technically not 100% correct, but a simplification, as it is limited by the maximum word count values in the Transmit and Control Data Registers). However, in case there is both data to transmit and to receive, the transmit limit is overwritten by the receive limit. Fix this by using the minimum applicable FIFO size instead. Move the calculation outside the loop, so it is not repeated for each individual DMA transfer. As currently tx_fifo_size is always equal to rx_fifo_size, this bug had no real impact. Fixes: fe78d0b7691c0274 ("spi: sh-msiof: Fix FIFO size to 64 word from 256 word") Signed-off-by: Geert Uytterhoeven Link: https://patch.msgid.link/d9961767a97758b2614f2ee8afe1bd56dc900a60.1747401908.git.geert+renesas@glider.be Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-sh-msiof.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index 3519656515ea1..1870f8c852131 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -918,6 +918,7 @@ static int sh_msiof_transfer_one(struct spi_controller *ctlr, void *rx_buf = t->rx_buf; unsigned int len = t->len; unsigned int bits = t->bits_per_word; + unsigned int max_wdlen = 256; unsigned int bytes_per_word; unsigned int words; int n; @@ -931,17 +932,17 @@ static int sh_msiof_transfer_one(struct spi_controller *ctlr, if (!spi_controller_is_target(p->ctlr)) sh_msiof_spi_set_clk_regs(p, t); + if (tx_buf) + max_wdlen = min(max_wdlen, p->tx_fifo_size); + if (rx_buf) + max_wdlen = min(max_wdlen, p->rx_fifo_size); + while (ctlr->dma_tx && len > 15) { /* * DMA supports 32-bit words only, hence pack 8-bit and 16-bit * words, with byte resp. word swapping. */ - unsigned int l = 0; - - if (tx_buf) - l = min(round_down(len, 4), p->tx_fifo_size * 4); - if (rx_buf) - l = min(round_down(len, 4), p->rx_fifo_size * 4); + unsigned int l = min(round_down(len, 4), max_wdlen * 4); if (bits <= 8) { copy32 = copy_bswap32; -- 2.39.5