From patchwork Fri Apr 26 12:12:54 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dominik Dingel X-Patchwork-Id: 239838 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 0734F2C00F0 for ; Fri, 26 Apr 2013 22:16:16 +1000 (EST) Received: from localhost ([::1]:44775 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UVhZW-0007cF-5s for incoming@patchwork.ozlabs.org; Fri, 26 Apr 2013 08:16:14 -0400 Received: from eggs.gnu.org ([208.118.235.92]:58531) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UVhWw-0003sl-Vr for qemu-devel@nongnu.org; Fri, 26 Apr 2013 08:13:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UVhWu-0002KT-2P for qemu-devel@nongnu.org; Fri, 26 Apr 2013 08:13:34 -0400 Received: from e06smtp16.uk.ibm.com ([195.75.94.112]:58365) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UVhWt-0002KF-P5 for qemu-devel@nongnu.org; Fri, 26 Apr 2013 08:13:31 -0400 Received: from /spool/local by e06smtp16.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Cornelia Huck Try to handle at least some of the errors that may happen. Signed-off-by: Cornelia Huck diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 1bd17d4..e0cede5 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -84,7 +84,9 @@ static int run_ccw(struct subchannel_id schid, int cmd, void *ptr, int len) * assume that a simple tsch will have finished the CCW processing, * but the architecture allows for asynchronous operation */ - drain_irqs(schid); + if (!r) { + r = drain_irqs(schid); + } return r; } @@ -92,7 +94,9 @@ static void virtio_set_status(struct subchannel_id schid, unsigned long dev_addr) { unsigned char status = dev_addr; - run_ccw(schid, CCW_CMD_WRITE_STATUS, &status, sizeof(status)); + if (run_ccw(schid, CCW_CMD_WRITE_STATUS, &status, sizeof(status))) { + virtio_panic("Could not write status to host!\n"); + } } static void virtio_reset(struct subchannel_id schid) @@ -193,6 +197,7 @@ static int virtio_read_many(ulong sector, void *load_addr, int sec_num) { struct virtio_blk_outhdr out_hdr; u8 status; + int r; /* Tell the host we want to read */ out_hdr.type = VIRTIO_BLK_T_IN; @@ -213,8 +218,11 @@ static int virtio_read_many(ulong sector, void *load_addr, int sec_num) /* Now we can tell the host to read */ vring_wait_reply(&block, 0); - drain_irqs(block.schid); - + r = drain_irqs(block.schid); + if (r) { + /* Well, whatever status is supposed to contain... */ + status = 1; + } return status; } @@ -262,8 +270,9 @@ void virtio_setup_block(struct subchannel_id schid) info.num = 128; block.schid = schid; - run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info)); - virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK); + if (!run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info))) { + virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK); + } } bool virtio_is_blk(struct subchannel_id schid)