From: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Date: Thu, 26 Mar 2020 16:58:00 +0100
Subject: [PATCH] ata: simplify ata_scsiop_inq_89()
Git-commit: 33531001364d32a79b34da2dd4089715384d0968
Patch-mainline: v5.7-rc1
References: bsc#1175995,jsc#SLE-15608
Initialize rbuf[] directly instead of using ata_tf_to_fis(). This
results in simpler and smaller code. It also allows separating
ata_tf_to_fis() into SATA specific libata part in the future.
Code size savings on m68k arch using (modified) atari_defconfig:
text data bss dec hex filename
before:
20824 105 4096 25025 61c1 drivers/ata/libata-scsi.o
after:
20782 105 4096 24983 6197 drivers/ata/libata-scsi.o
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/ata/libata-scsi.c | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 005c6f2f7d21..0912acb82b80 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2357,10 +2357,6 @@ static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
*/
static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
{
- struct ata_taskfile tf;
-
- memset(&tf, 0, sizeof(tf));
-
rbuf[1] = 0x89; /* our page code */
rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
rbuf[3] = (0x238 & 0xff);
@@ -2369,14 +2365,14 @@ static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
memcpy(&rbuf[16], "libata ", 16);
memcpy(&rbuf[32], DRV_VERSION, 4);
- /* we don't store the ATA device signature, so we fake it */
-
- tf.command = ATA_DRDY; /* really, this is Status reg */
- tf.lbal = 0x1;
- tf.nsect = 0x1;
-
- ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
+ rbuf[37] = (1 << 7); /* bit 7 indicates Command FIS */
+ /* TODO: PMP? */
+
+ /* we don't store the ATA device signature, so we fake it */
+ rbuf[38] = ATA_DRDY; /* really, this is Status reg */
+ rbuf[40] = 0x1;
+ rbuf[48] = 0x1;
rbuf[56] = ATA_CMD_ID_ATA;
--
2.16.4