tscam(), atp870_init(), atp880_init() and atp885_init() are never called in atomic context. They call mdelay() to busily wait, which is not necessary. mdelay() can be replaced with msleep(). This is found by a static analysis tool named DCNS written by myself. Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx> --- drivers/scsi/atp870u.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/atp870u.c b/drivers/scsi/atp870u.c index b46997cf77e2..8996d2329e11 100644 --- a/drivers/scsi/atp870u.c +++ b/drivers/scsi/atp870u.c @@ -1055,7 +1055,7 @@ static void tscam(struct Scsi_Host *host, bool wide_chip, u8 scam_on) udelay(2); /* 2 deskew delay(45ns*2=90ns) */ val &= 0x007f; /* no bsy */ atp_writew_io(dev, 0, 0x1c, val); - mdelay(128); + msleep(128); val &= 0x00fb; /* after 1ms no msg */ atp_writew_io(dev, 0, 0x1c, val); while ((atp_readb_io(dev, 0, 0x1c) & 0x04) != 0) @@ -1286,9 +1286,9 @@ static void atp870_init(struct Scsi_Host *shpnt) k = (atp_readb_base(atpdev, 0x3a) & 0xf3) | 0x10; atp_writeb_base(atpdev, 0x3a, k); atp_writeb_base(atpdev, 0x3a, k & 0xdf); - mdelay(32); + msleep(32); atp_writeb_base(atpdev, 0x3a, k); - mdelay(32); + msleep(32); atp_set_host_id(atpdev, 0, host_id); tscam(shpnt, wide_chip, scam_on); @@ -1370,9 +1370,9 @@ static void atp880_init(struct Scsi_Host *shpnt) k = atp_readb_base(atpdev, 0x38) & 0x80; atp_writeb_base(atpdev, 0x38, k); atp_writeb_base(atpdev, 0x3b, 0x20); - mdelay(32); + msleep(32); atp_writeb_base(atpdev, 0x3b, 0); - mdelay(32); + msleep(32); atp_readb_io(atpdev, 0, 0x1b); atp_readb_io(atpdev, 0, 0x17); @@ -1454,10 +1454,10 @@ static void atp885_init(struct Scsi_Host *shpnt) atp_writeb_base(atpdev, 0x28, k); atp_writeb_pci(atpdev, 0, 1, 0x80); atp_writeb_pci(atpdev, 1, 1, 0x80); - mdelay(100); + msleep(100); atp_writeb_pci(atpdev, 0, 1, 0); atp_writeb_pci(atpdev, 1, 1, 0); - mdelay(1000); + msleep(1000); atp_readb_io(atpdev, 0, 0x1b); atp_readb_io(atpdev, 0, 0x17); atp_readb_io(atpdev, 1, 0x1b); @@ -1473,7 +1473,7 @@ static void atp885_init(struct Scsi_Host *shpnt) k = (k & 0x07) | 0x40; atp_set_host_id(atpdev, 1, k); - mdelay(600); /* this delay used to be called tscam_885() */ + msleep(600); /* this delay used to be called tscam_885() */ dev_info(&pdev->dev, "Scanning Channel A SCSI Device ...\n"); atp_is(atpdev, 0, true, atp_readb_io(atpdev, 0, 0x1b) >> 7); atp_writeb_io(atpdev, 0, 0x16, 0x80); -- 2.17.0
