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megaraid_sas: fix a small problem when reading state value from hw

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When the driver reads state values from the hw it might happen that
different values are read in subsequent reads and this can cause problems,
this may lead to a timeout in this function and a non working adapter.

Cc: Adam Radford <aradford@gmail.com>

Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Shintaro Minemoto <fj3207hq@aa.jp.fujitsu.com>
Acked-by: Sumit Saxena <sumit.saxena@lsi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Tomas Henzl 2014-04-01 13:59:50 +02:00 committed by Christoph Hellwig
parent d6d211db37
commit bc6ac5e8c2
1 changed files with 7 additions and 8 deletions
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15
drivers/scsi/megaraid/megaraid_sas_base.c
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@ -3061,7 +3061,8 @@ megasas_transition_to_ready(struct megasas_instance *instance, int ocr)
u32 cur_state;
u32 abs_state, curr_abs_state;
fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) & MFI_STATE_MASK;
abs_state = instance->instancet->read_fw_status_reg(instance->reg_set);
fw_state = abs_state & MFI_STATE_MASK;
if (fw_state != MFI_STATE_READY)
printk(KERN_INFO "megasas: Waiting for FW to come to ready"
@ -3069,9 +3070,6 @@ megasas_transition_to_ready(struct megasas_instance *instance, int ocr)
while (fw_state != MFI_STATE_READY) {
abs_state =
instance->instancet->read_fw_status_reg(instance->reg_set);
switch (fw_state) {
case MFI_STATE_FAULT:
@ -3223,10 +3221,8 @@ 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 * 1000); i++) {
fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) &
MFI_STATE_MASK ;
curr_abs_state =
instance->instancet->read_fw_status_reg(instance->reg_set);
curr_abs_state = instance->instancet->
read_fw_status_reg(instance->reg_set);
if (abs_state == curr_abs_state) {
msleep(1);
@ -3242,6 +3238,9 @@ megasas_transition_to_ready(struct megasas_instance *instance, int ocr)
"in %d secs\n", fw_state, max_wait);
return -ENODEV;
}
abs_state = curr_abs_state;
fw_state = curr_abs_state & MFI_STATE_MASK;
}
printk(KERN_INFO "megasas: FW now in Ready state\n");