From patchwork Mon May 7 12:00:45 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: rtl8139: fix regression in TxStatus/TxAddr read Date: Mon, 07 May 2012 02:00:45 -0000 From: Avi Kivity X-Patchwork-Id: 157298 Message-Id: <1336392045-31211-1-git-send-email-avi@redhat.com> To: qemu-devel@nongnu.org Cc: Jason Wang , "Michael S. Tsirkin" Commit afe0a595356192 added byte reads for TxStatus/TxAddr, but broke 32-bit reads; the mask generation (1 << (8 * size)) - 1 is unspecified in C for size >= sizeof(int), and in fact returns 0 on x86. Fix by using a larger type. Fixes (at least) Fedora 9 i386 with -machine kernel_irqchip=on. I didn't see it with the qemu APIC implementation; may be due to timing or (more likely) a tester error. Signed-off-by: Avi Kivity --- hw/rtl8139.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/rtl8139.c b/hw/rtl8139.c index 4d0f5ba..eb22d04 100644 --- a/hw/rtl8139.c +++ b/hw/rtl8139.c @@ -2500,7 +2500,7 @@ static uint32_t rtl8139_TxStatus_TxAddr_read(RTL8139State *s, uint32_t regs[], case 1: /* fall through */ case 2: /* fall through */ case 4: - ret = (regs[reg] >> offset * 8) & ((1 << (size * 8)) - 1); + ret = (regs[reg] >> offset * 8) & (((uint64_t)1 << (size * 8)) - 1); DPRINTF("TxStatus/TxAddr[%d] read addr=0x%x size=0x%x val=0x%08x\n", reg, addr, size, ret); break;