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libqos/ahci: fix memory management bugs 

There's a handful of trivial bugs in the libqos/ahci functions,
squish them together.

- Zero cached pointers after freeing them
- The Command List Buffer is an array of 32x 32 byte structures, not
  32x 8 byte pointers -- it's 1MiB, not 256 bytes. Zero it ALL.
- Free the correct command in ahci_pick_cmd.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1434470575-21625-4-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2015-07-04 02:06:02 -04:00
parent 0d3e9d1f59
commit 95ea663693
1 changed files with 4 additions and 2 deletions
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6
tests/libqos/ahci.c
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@ -138,12 +138,14 @@ void ahci_clean_mem(AHCIQState *ahci)
for (port = 0; port < 32; ++port) {
if (ahci->port[port].fb) {
ahci_free(ahci, ahci->port[port].fb);
ahci->port[port].fb = 0;
}
if (ahci->port[port].clb) {
for (slot = 0; slot < 32; slot++) {
ahci_destroy_command(ahci, port, slot);
}
ahci_free(ahci, ahci->port[port].clb);
ahci->port[port].clb = 0;
}
}
}
@ -252,7 +254,7 @@ void ahci_hba_enable(AHCIQState *ahci)
/* Allocate Memory for the Command List Buffer & FIS Buffer */
/* PxCLB space ... 0x20 per command, as in 4.2.2 p 36 */
ahci->port[i].clb = ahci_alloc(ahci, num_cmd_slots * 0x20);
qmemset(ahci->port[i].clb, 0x00, 0x100);
qmemset(ahci->port[i].clb, 0x00, num_cmd_slots * 0x20);
g_test_message("CLB: 0x%08" PRIx64, ahci->port[i].clb);
ahci_px_wreg(ahci, i, AHCI_PX_CLB, ahci->port[i].clb);
g_assert_cmphex(ahci->port[i].clb, ==,
@ -549,7 +551,7 @@ unsigned ahci_pick_cmd(AHCIQState *ahci, uint8_t port)
if (reg & (1 << j)) {
continue;
}
ahci_destroy_command(ahci, port, i);
ahci_destroy_command(ahci, port, j);
ahci->port[port].next = (j + 1) % 32;
return j;
}