From a6bc46fecbb3463447cd1e79afe60704afaa55e8 Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Thu, 16 Jul 2015 16:16:00 +0200 Subject: [PATCH 3/3] ide: Clear DRQ after handling all expected accesses Message-id: <1437056160-3284-4-git-send-email-kwolf@redhat.com> Patchwork-id: n/a O-Subject: [virt-devel] [RHEL/RHEV-7 qemu-kvm(-rhev) EMBARGOED PATCH 3/3] ide: Clear DRQ after handling all expected accesses Bugzilla: 1243689 RH-Acked-by: Petr Matousek RH-Acked-by: John Snow RH-Acked-by: Stefan Hajnoczi This is additional hardening against an end_transfer_func that fails to clear the DRQ status bit. The bit must be unset as soon as the PIO transfer has completed, so it's better to do this in a central place instead of duplicating the code in all commands (and forgetting it in some). Signed-off-by: Kevin Wolf --- hw/ide/core.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/hw/ide/core.c b/hw/ide/core.c index ada26c0..cd2e964 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -1856,8 +1856,10 @@ void ide_data_writew(void *opaque, uint32_t addr, uint32_t val) *(uint16_t *)p = le16_to_cpu(val); p += 2; s->data_ptr = p; - if (p >= s->data_end) + if (p >= s->data_end) { + s->status &= ~DRQ_STAT; s->end_transfer_func(s); + } } uint32_t ide_data_readw(void *opaque, uint32_t addr) @@ -1881,8 +1883,10 @@ uint32_t ide_data_readw(void *opaque, uint32_t addr) ret = cpu_to_le16(*(uint16_t *)p); p += 2; s->data_ptr = p; - if (p >= s->data_end) + if (p >= s->data_end) { + s->status &= ~DRQ_STAT; s->end_transfer_func(s); + } return ret; } @@ -1906,8 +1910,10 @@ void ide_data_writel(void *opaque, uint32_t addr, uint32_t val) *(uint32_t *)p = le32_to_cpu(val); p += 4; s->data_ptr = p; - if (p >= s->data_end) + if (p >= s->data_end) { + s->status &= ~DRQ_STAT; s->end_transfer_func(s); + } } uint32_t ide_data_readl(void *opaque, uint32_t addr) @@ -1931,8 +1937,10 @@ uint32_t ide_data_readl(void *opaque, uint32_t addr) ret = cpu_to_le32(*(uint32_t *)p); p += 4; s->data_ptr = p; - if (p >= s->data_end) + if (p >= s->data_end) { + s->status &= ~DRQ_STAT; s->end_transfer_func(s); + } return ret; } -- 1.8.3.1