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scsi: megaraid_sas: reduce module load time

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[ Upstream commit 31b6a05f86 ]

megaraid_sas takes 1+ seconds to load while waiting for firmware:

[2.822603] megaraid_sas 0000:03:00.0: Waiting for FW to come to ready state
[3.871003] megaraid_sas 0000:03:00.0: FW now in Ready state

This is due to the following loop in megasas_transition_to_ready(), which
waits a minimum of 1 second, even though the FW becomes ready in tens of
millisecs:

        /*
         * The cur_state should not last for more than max_wait secs
         */
        for (i = 0; i < max_wait; i++) {
                ...
                msleep(1000);
        ...
        dev_info(&instance->pdev->dev, "FW now in Ready state\n");

This is a regression, caused by a change of the msleep granularity from 1
to 1000 due to concern about waiting too long on systems with coarse
jiffies.

To fix, increase iterations and use msleep(20), which results in:

[2.670627] megaraid_sas 0000:03:00.0: Waiting for FW to come to ready state
[2.739386] megaraid_sas 0000:03:00.0: FW now in Ready state

Fixes: fb2f3e96d80f ("scsi: megaraid_sas: Fix msleep granularity")
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Steve Sistare
2019-03-01 06:46:28 -08:00
committed by Chris
parent 691321e9a6
commit 2162bf1569
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/megaraid/megaraid_sas_base.c
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@@ -3694,12 +3694,12 @@ megasas_transition_to_ready(struct megasas_instance *instance, int ocr)
/*
* The cur_state should not last for more than max_wait secs
*/
for (i = 0; i < max_wait; i++) {
for (i = 0; i < max_wait * 50; i++) {
curr_abs_state = instance->instancet->
read_fw_status_reg(instance->reg_set);
if (abs_state == curr_abs_state) {
msleep(1000);
msleep(20);
} else
break;
}