From: John Snow <js...@redhat.com> Instead of checking for a known byte, inspect the fields of this byte explicitly to produce more meaningful error messages and improve the readability of this section.
Signed-off-by: John Snow <js...@redhat.com> Reviewed-by: Paolo Bonzini <pbonz...@redhat.com> Message-id: 1415058979-16604-5-git-send-email-js...@redhat.com Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> --- hw/ide/ahci.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c index 578a93b..d6b012c 100644 --- a/hw/ide/ahci.c +++ b/hw/ide/ahci.c @@ -1004,17 +1004,18 @@ static int handle_cmd(AHCIState *s, int port, int slot) break; } - switch (cmd_fis[1]) { - case SATA_FIS_REG_H2D_UPDATE_COMMAND_REGISTER: - break; - case 0: - break; - default: - DPRINTF(port, "unknown command cmd_fis[0]=%02x cmd_fis[1]=%02x " - "cmd_fis[2]=%02x\n", cmd_fis[0], cmd_fis[1], - cmd_fis[2]); - goto out; - break; + if (cmd_fis[1] & 0x0F) { + DPRINTF(port, "Port Multiplier not supported." + " cmd_fis[0]=%02x cmd_fis[1]=%02x cmd_fis[2]=%02x\n", + cmd_fis[0], cmd_fis[1], cmd_fis[2]); + goto out; + } + + if (cmd_fis[1] & 0x70) { + DPRINTF(port, "Reserved flags set in H2D Register FIS." + " cmd_fis[0]=%02x cmd_fis[1]=%02x cmd_fis[2]=%02x\n", + cmd_fis[0], cmd_fis[1], cmd_fis[2]); + goto out; } if (!(cmd_fis[1] & SATA_FIS_REG_H2D_UPDATE_COMMAND_REGISTER)) { -- 2.1.0