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 B6F59145A18; Tue, 30 Jul 2024 15:53:47 +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=1722354827; cv=none; b=jTxGp8qAiYKdYTbrZwX2r2XZXN442fjimajc7WZERHmD/mI/9EHTEhbU7JjX5KnwvrGKwKwwWq8A6ivi7pH3lMh0b32XcHOUitJAIea2NJ2lFnJ5nhVEu3Jcj4vouxDrBqlYBDwDGZBvgMqTIEIKgJ0HdQ/tCMSTCEx911S6u4E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722354827; c=relaxed/simple; bh=hzZyekkKPF5ePiEBYjnSaf1Vnjc/bmtCooF+NqpcbUU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HdR13V7+aJg2ziCsdfZerKWuf7doFqINOfJVpcQreydaUkZ3I9CwUtF403WaFg9oysG4CmvTPHwNj5AyXOwh9m34lal7dSDaCHLfiPqRPByUePaabr/3eejPIaigeM4M/UyGbjrN6hgzBZVoSKhtPI2M9TODEuIW9u+X23Xl1DA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=lQFXw9up; 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="lQFXw9up" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 222C9C32782; Tue, 30 Jul 2024 15:53:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1722354827; bh=hzZyekkKPF5ePiEBYjnSaf1Vnjc/bmtCooF+NqpcbUU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lQFXw9up0l20uuwqaI8xAUw39D+Zkze/h3GNfa5IFr8iGUhPaQluT1J5giv4v6bNc qKPVbQwYcWTpOhgaAD+4RK8tfNI0Y3NKdU8jpRWPrTSpcjOQ8bfggg7JvBc7h6mYGM HNbToaPPHJnajJD3N/g1Hp/IhuOYoFHobTVxuhtU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christoph Hellwig , "Martin K. Petersen" , Anton Ivanov , Jens Axboe , Sasha Levin Subject: [PATCH 6.1 007/440] ubd: refactor the interrupt handler Date: Tue, 30 Jul 2024 17:44:00 +0200 Message-ID: <20240730151616.047770248@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240730151615.753688326@linuxfoundation.org> References: <20240730151615.753688326@linuxfoundation.org> User-Agent: quilt/0.67 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-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christoph Hellwig [ Upstream commit 5db755fbb1a0de4a4cfd5d5edfaa19853b9c56e6 ] Instead of a separate handler function that leaves no work in the interrupt hanler itself, split out a per-request end I/O helper and clean up the coding style and variable naming while we're at it. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Acked-By: Anton Ivanov Link: https://lore.kernel.org/r/20240531074837.1648501-2-hch@lst.de Signed-off-by: Jens Axboe Stable-dep-of: 31ade7d4fdcf ("ubd: untagle discard vs write zeroes not support handling") Signed-off-by: Sasha Levin --- arch/um/drivers/ubd_kern.c | 49 ++++++++++++++------------------------ 1 file changed, 18 insertions(+), 31 deletions(-) diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 13a22a4613051..2670f951732c1 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -456,43 +456,30 @@ static int bulk_req_safe_read( return n; } -/* Called without dev->lock held, and only in interrupt context. */ -static void ubd_handler(void) +static void ubd_end_request(struct io_thread_req *io_req) { - int n; - int count; - - while(1){ - n = bulk_req_safe_read( - thread_fd, - irq_req_buffer, - &irq_remainder, - &irq_remainder_size, - UBD_REQ_BUFFER_SIZE - ); - if (n < 0) { - if(n == -EAGAIN) - break; - printk(KERN_ERR "spurious interrupt in ubd_handler, " - "err = %d\n", -n); - return; - } - for (count = 0; count < n/sizeof(struct io_thread_req *); count++) { - struct io_thread_req *io_req = (*irq_req_buffer)[count]; - - if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) { - blk_queue_max_discard_sectors(io_req->req->q, 0); - blk_queue_max_write_zeroes_sectors(io_req->req->q, 0); - } - blk_mq_end_request(io_req->req, io_req->error); - kfree(io_req); - } + if (io_req->error == BLK_STS_NOTSUPP && + req_op(io_req->req) == REQ_OP_DISCARD) { + blk_queue_max_discard_sectors(io_req->req->q, 0); + blk_queue_max_write_zeroes_sectors(io_req->req->q, 0); } + blk_mq_end_request(io_req->req, io_req->error); + kfree(io_req); } static irqreturn_t ubd_intr(int irq, void *dev) { - ubd_handler(); + int len, i; + + while ((len = bulk_req_safe_read(thread_fd, irq_req_buffer, + &irq_remainder, &irq_remainder_size, + UBD_REQ_BUFFER_SIZE)) >= 0) { + for (i = 0; i < len / sizeof(struct io_thread_req *); i++) + ubd_end_request((*irq_req_buffer)[i]); + } + + if (len < 0 && len != -EAGAIN) + pr_err("spurious interrupt in %s, err = %d\n", __func__, len); return IRQ_HANDLED; } -- 2.43.0