From 33531001364d32a79b34da2dd4089715384d0968 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Thu, 26 Mar 2020 16:58:00 +0100 Subject: [PATCH] ata: simplify ata_scsiop_inq_89() 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 Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Jens Axboe --- 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; -- 2.39.5