diff options
| author | John Snow <jsnow@redhat.com> | 2015-07-04 02:06:05 -0400 |
|---|---|---|
| committer | John Snow <jsnow@redhat.com> | 2015-07-04 02:06:05 -0400 |
| commit | e08a98357b5811e7933ff077f6da4b85175caf8a (patch) | |
| tree | c810139efe4ddf237f34d9c9ac767c1fc49f1648 /hw/ide | |
| parent | 9364384de0e3b8a5bdea67ba49bee9ea7f1b8f26 (diff) | |
ahci: correct ncq sector count
uint16_t isn't enough to hold the real sector count, since a value of
zero implies a full 64K sectors, so we need a uint32_t here.
We *could* cheat and pretend that this value is 0-based and fit it in
a uint16_t, but I'd rather waste 2 bytes instead of a future dev's
10 minutes when they forget to +1/-1 accordingly somewhere.
See SATA 3.2, section 13.6.4.1 "READ FPDMA QUEUED".
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1435767578-32743-9-git-send-email-jsnow@redhat.com
Diffstat (limited to 'hw/ide')
| -rw-r--r-- | hw/ide/ahci.c | 7 | ||||
| -rw-r--r-- | hw/ide/ahci.h | 2 |
2 files changed, 6 insertions, 3 deletions
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c index efd07ac804..1027a60a9b 100644 --- a/hw/ide/ahci.c +++ b/hw/ide/ahci.c @@ -1086,8 +1086,11 @@ static void process_ncq_command(AHCIState *s, int port, uint8_t *cmd_fis, DPRINTF(port, "Warn: Unsupported attempt to use Rebuild Assist\n"); } - ncq_tfs->sector_count = ((uint16_t)ncq_fis->sector_count_high << 8) | - ncq_fis->sector_count_low; + ncq_tfs->sector_count = ((ncq_fis->sector_count_high << 8) | + ncq_fis->sector_count_low); + if (!ncq_tfs->sector_count) { + ncq_tfs->sector_count = 0x10000; + } size = ncq_tfs->sector_count * 512; ahci_populate_sglist(ad, &ncq_tfs->sglist, size, 0); diff --git a/hw/ide/ahci.h b/hw/ide/ahci.h index c728e3a07d..9090d3d882 100644 --- a/hw/ide/ahci.h +++ b/hw/ide/ahci.h @@ -256,7 +256,7 @@ typedef struct NCQTransferState { BlockAIOCB *aiocb; QEMUSGList sglist; BlockAcctCookie acct; - uint16_t sector_count; + uint32_t sector_count; uint64_t lba; uint8_t tag; uint8_t cmd; |