[PATCH 4/9] aacraid: Do not wait for outstanding write commands on synchronize_cache

Hannes Reinecke
2019-11-18T09:22:37Z

There is no need to wait for outstanding write commands on synchronize
cache; the block layer is responsible for I/O scheduling, so we shouldn't
try to out-guess it on the driver layer.

Cc: Balsundar P <balsundar.p@microsemi.com>
Cc: Adaptec OEM Raid Solutions <aacraid@microsemi.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/aacraid/aachba.c | 76 ++-----------------------------------------
1 file changed, 2 insertions(+), 74 deletions(-)

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index e36608ce937a..cfa14e15d5f0 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -2601,9 +2601,7 @@ static int aac_write(struct scsi_cmnd * scsicmd)
static void synchronize_callback(void *context, struct fib *fibptr)
{
struct aac_synchronize_reply *synchronizereply;
- struct scsi_cmnd *cmd;
-
- cmd = context;
+ struct scsi_cmnd *cmd = context;

if (!aac_valid_context(cmd, fibptr))
return;
@@ -2644,77 +2642,8 @@ static int aac_synchronize(struct scsi_cmnd *scsicmd)
int status;
struct fib *cmd_fibcontext;
struct aac_synchronize *synchronizecmd;
- struct scsi_cmnd *cmd;
struct scsi_device *sdev = scsicmd->device;
- int active = 0;
struct aac_dev *aac;
- u64 lba = ((u64)scsicmd->cmnd[2] << 24) | (scsicmd->cmnd[3] << 16) |
- (scsicmd->cmnd[4] << 8) | scsicmd->cmnd[5];
- u32 count = (scsicmd->cmnd[7] << 8) | scsicmd->cmnd[8];
- unsigned long flags;
-
- /*
- * Wait for all outstanding queued commands to complete to this
- * specific target (block).
- */
- spin_lock_irqsave(&sdev->list_lock, flags);
- list_for_each_entry(cmd, &sdev->cmd_list, list)
- if (cmd->SCp.phase == AAC_OWNER_FIRMWARE) {
- u64 cmnd_lba;
- u32 cmnd_count;
-
- if (cmd->cmnd[0] == WRITE_6) {
- cmnd_lba = ((cmd->cmnd[1] & 0x1F) << 16) |
- (cmd->cmnd[2] << 8) |
- cmd->cmnd[3];
- cmnd_count = cmd->cmnd[4];
- if (cmnd_count == 0)
- cmnd_count = 256;
- } else if (cmd->cmnd[0] == WRITE_16) {
- cmnd_lba = ((u64)cmd->cmnd[2] << 56) |
- ((u64)cmd->cmnd[3] << 48) |
- ((u64)cmd->cmnd[4] << 40) |
- ((u64)cmd->cmnd[5] << 32) |
- ((u64)cmd->cmnd[6] << 24) |
- (cmd->cmnd[7] << 16) |
- (cmd->cmnd[8] << 8) |
- cmd->cmnd[9];
- cmnd_count = (cmd->cmnd[10] << 24) |
- (cmd->cmnd[11] << 16) |
- (cmd->cmnd[12] << 8) |
- cmd->cmnd[13];
- } else if (cmd->cmnd[0] == WRITE_12) {
- cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
- (cmd->cmnd[3] << 16) |
- (cmd->cmnd[4] << 8) |
- cmd->cmnd[5];
- cmnd_count = (cmd->cmnd[6] << 24) |
- (cmd->cmnd[7] << 16) |
- (cmd->cmnd[8] << 8) |
- cmd->cmnd[9];
- } else if (cmd->cmnd[0] == WRITE_10) {
- cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
- (cmd->cmnd[3] << 16) |
- (cmd->cmnd[4] << 8) |
- cmd->cmnd[5];
- cmnd_count = (cmd->cmnd[7] << 8) |
- cmd->cmnd[8];
- } else
- continue;
- if (((cmnd_lba + cmnd_count) < lba) ||
- (count && ((lba + count) < cmnd_lba)))
- continue;
- ++active;
- break;
- }
-
- spin_unlock_irqrestore(&sdev->list_lock, flags);
-
- /*
- * Yield the processor (requeue for later)
- */
- if (active)
- return SCSI_MLQUEUE_DEVICE_BUSY;

aac = (struct aac_dev *)sdev->host->hostdata;
if (aac->in_reset)
@@ -2723,8 +2652,7 @@ static int aac_synchronize(struct scsi_cmnd *scsicmd)
/*
* Allocate and initialize a Fib
*/
- if (!(cmd_fibcontext = aac_fib_alloc(aac)))
- return SCSI_MLQUEUE_HOST_BUSY;
+ cmd_fibcontext = aac_fib_alloc_tag(aac, scsicmd);

aac_fib_init(cmd_fibcontext);

--
2.16.4