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libata: only ports >= 0 need to synchronize 

In a discussio with Jeff Garzik, he mentioned that the serialization
for the libata port probes only needs to be within the domain of a host.
This means that for the first port of each host (with ID 0), we don't
need to wait, so we can relax our serialization a little.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arjan van de Ven 2009-01-10 10:18:44 -08:00 committed by Linus Torvalds
parent 886ad09fc8
commit fa853a4841
1 changed files with 3 additions and 1 deletions
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4
drivers/ata/libata-core.c
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@ -5925,8 +5925,10 @@ static void async_port_probe(void *data, async_cookie_t cookie)
* If we're not allowed to scan this host in parallel,
* we need to wait until all previous scans have completed
* before going further.
* Jeff Garzik says this is only within a controller, so we
* don't need to wait for port 0, only for later ports.
*/
if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN))
if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
async_synchronize_cookie(cookie);
/* probe */