Thread (9 messages) 9 messages, 3 authors, 2021-11-25

Re: [PATCH] pata_falcon: Add missing __iomem annotations

From: Michael Schmitz <schmitzmic@gmail.com>
Date: 2021-11-24 04:52:24
Also in: lkml

Hi Finn,

thanks for your patch!

On 24/11/21 17:25, Finn Thain wrote:
The zero day bot reported some sparse complaints in pata_falcon.c. E.g.

drivers/ata/pata_falcon.c:58:41: warning: cast removes address space '__iomem' of expression
drivers/ata/pata_falcon.c:58:41: warning: incorrect type in argument 1 (different address spaces)
drivers/ata/pata_falcon.c:58:41:    expected unsigned short volatile [noderef] [usertype] __iomem *port
drivers/ata/pata_falcon.c:58:41:    got unsigned short [usertype] *

The same thing shows up in 8 places, all told. Avoid this by use of
__iomem type casts.
Seeing as data_addr was explicitly typed as __iomem, your fix is clearly 
correct. Bit embarrassing to have missed that (I remember adding __iomem 
annotations elsewhere at some stage).

If you think there's any need to test this change, say so.

Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
quoted hunk ↗ jump to hunk
Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Bartlomiej Zolnierkiewicz <redacted>
Cc: Jens Axboe <axboe@kernel.dk>
Reported-by: kernel test robot <redacted>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
---
 drivers/ata/pata_falcon.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c
index 121635aa8c00..e2a88edd9dbf 100644
--- a/drivers/ata/pata_falcon.c
+++ b/drivers/ata/pata_falcon.c
@@ -55,14 +55,14 @@ static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
 	/* Transfer multiple of 2 bytes */
 	if (rw == READ) {
 		if (swap)
-			raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
+			raw_insw_swapw((u16 __iomem *)data_addr, (u16 *)buf, words);
 		else
-			raw_insw((u16 *)data_addr, (u16 *)buf, words);
+			raw_insw((u16 __iomem *)data_addr, (u16 *)buf, words);
 	} else {
 		if (swap)
-			raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
+			raw_outsw_swapw((u16 __iomem *)data_addr, (u16 *)buf, words);
 		else
-			raw_outsw((u16 *)data_addr, (u16 *)buf, words);
+			raw_outsw((u16 __iomem *)data_addr, (u16 *)buf, words);
 	}

 	/* Transfer trailing byte, if any. */
@@ -74,16 +74,16 @@ static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,

 		if (rw == READ) {
 			if (swap)
-				raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1);
+				raw_insw_swapw((u16 __iomem *)data_addr, (u16 *)pad, 1);
 			else
-				raw_insw((u16 *)data_addr, (u16 *)pad, 1);
+				raw_insw((u16 __iomem *)data_addr, (u16 *)pad, 1);
 			*buf = pad[0];
 		} else {
 			pad[0] = *buf;
 			if (swap)
-				raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
+				raw_outsw_swapw((u16 __iomem *)data_addr, (u16 *)pad, 1);
 			else
-				raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
+				raw_outsw((u16 __iomem *)data_addr, (u16 *)pad, 1);
 		}
 		words++;
 	}
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