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libqos: allow zero-size allocations

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As part of streamlining the AHCI tests interface, it'd be nice
if specying a size of zero could be handled without special branches
and the allocator could handle this special case gracefully.

This lets me use the "ahci_io" macros for non-data commands, too,
which moves me forward towards shepherding all AHCI qtests into
a common set of commands in a unified pipeline.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1452282920-21550-6-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2016-01-11 14:10:43 -05:00
parent b88641e236
commit b1b66c3b5e
3 changed files with 8 additions and 10 deletions
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6
tests/libqos/ahci.c
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@ -668,16 +668,16 @@ void ahci_io(AHCIQState *ahci, uint8_t port, uint8_t ide_cmd,
props = ahci_command_find(ide_cmd);
g_assert(props);
ptr = ahci_alloc(ahci, bufsize);
g_assert(ptr);
g_assert(!bufsize || ptr);
qmemset(ptr, 0x00, bufsize);
if (props->write) {
if (bufsize && props->write) {
bufwrite(ptr, buffer, bufsize);
}
ahci_guest_io(ahci, port, ide_cmd, ptr, bufsize, sector);
if (props->read) {
if (bufsize && props->read) {
bufread(ptr, buffer, bufsize);
}