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[SCSI] qla2xxx: Always serialize mailbox command execution.

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Original code would incorrectly bypass serialization if the DPC
thread were performing a big-hammer operation (ISP abort).  This
short circuit, though rare, would subsequently stomp on a
secondary thread's mailbox command execution.  Found during
ISP81XX testing.

Signed-off-by: Andrew Vasquez <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Andrew Vasquez 2009-01-22 09:45:31 -08:00 • committed by James Bottomley
commit 8eca3f39c4
1 changed files with 6 additions and 10 deletions
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16
drivers/scsi/qla2xxx/qla_mbx.c
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@ -58,14 +58,11 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
* seconds. This is to serialize actual issuing of mailbox cmds during
* non ISP abort time.
*/
if (!abort_active) {
if (!wait_for_completion_timeout(&ha->mbx_cmd_comp,
mcp->tov * HZ)) {
/* Timeout occurred. Return error. */
DEBUG2_3_11(printk("%s(%ld): cmd access timeout. "
"Exiting.\n", __func__, base_vha->host_no));
return QLA_FUNCTION_TIMEOUT;
}
if (!wait_for_completion_timeout(&ha->mbx_cmd_comp, mcp->tov * HZ)) {
/* Timeout occurred. Return error. */
DEBUG2_3_11(printk("%s(%ld): cmd access timeout. "
"Exiting.\n", __func__, base_vha->host_no));
return QLA_FUNCTION_TIMEOUT;
}
ha->flags.mbox_busy = 1;
@ -265,8 +262,7 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
}
/* Allow next mbx cmd to come in. */
if (!abort_active)
complete(&ha->mbx_cmd_comp);
complete(&ha->mbx_cmd_comp);
if (rval) {
DEBUG2_3_11(printk("%s(%ld): **** FAILED. mbx0=%x, mbx1=%x, "