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authorTejun Heo <htejun@gmail.com>2008-04-07 22:47:19 +0900
committerJeff Garzik <jgarzik@redhat.com>2008-04-17 15:44:23 -0400
commitac371987a81c61c2efbd6931245cdcaf43baad89 (patch)
treef88970931b26d2ad344d7d67ddabc64d9b48181d /drivers/ata/ahci.c
parent57c9efdfb3cee5d4564fcb5f70555e2edb1bc52a (diff)
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libata: clear SError after link resume
SError used to be cleared in ->postreset. This has small hotplug race condition. If a device is plugged in after reset is complete but postreset hasn't run yet, its hotplug event gets lost when SError is cleared. This patch makes sata_link_resume() clear SError. This kills the race condition and makes a lot of sense as some PMP and host PHYs don't work properly without SError cleared. This change makes sata_pmp_std_{pre|post}_reset()'s unnecessary as they become identical to ata_std counterparts. It also simplifies sata_pmp_hardreset() and ahci_vt8251_hardreset(). Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'drivers/ata/ahci.c')
-rw-r--r--drivers/ata/ahci.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 0f553aaa6f7..a69bcca4eb1 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1377,7 +1377,6 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
- u32 serror;
bool online;
int rc;
@@ -1388,10 +1387,6 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline, &online, NULL);
- /* vt8251 needs SError cleared for the port to operate */
- ahci_scr_read(ap, SCR_ERROR, &serror);
- ahci_scr_write(ap, SCR_ERROR, serror);
-
ahci_start_engine(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);