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rtl8139: fix regression in TxStatus/TxAddr read 

Commit afe0a59535 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 <avi@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Avi Kivity 2012-05-07 15:00:45 +03:00 committed by Michael S. Tsirkin
parent 847c25d01c
commit bdc62e62ea
1 changed files with 1 additions and 1 deletions
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2
hw/rtl8139.c
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@ -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;