linux-kernel - [PATCH 3.16 224/294] ata: hpt366: fix constant cast warning

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Message-ID: <lsq.1510009382.116848844@decadent.org.uk>
Date:   Mon, 06 Nov 2017 23:03:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Arnd Bergmann" <arnd@...db.de>,
        "Tejun Heo" <tj@...nel.org>,
        "Bartlomiej Zolnierkiewicz" <b.zolnierkie@...sung.com>
Subject: [PATCH 3.16 224/294] ata: hpt366: fix constant cast warning

3.16.50-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit 6ec0a86c645be3fce7ade42f165a6a417c3503b1 upstream.

gcc-5.x warns about a preexisting problem in the hpt36x pata driver:

drivers/ata/pata_hpt366.c: In function 'hpt36x_init_one':
drivers/ata/pata_hpt366.c:376:9: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-array-qualifiers]

Other ata drivers have the same problem, as ata_pci_bmdma_init_one
takes a non-const pointer, and they solve it by using a cast to
turn that pointer into a normal non-const pointer.

I also tried to change the ata core code to make host->private_data
a const pointer, but that quickly got out of hand, as some other
drivers expect it to be writable, so I ended up using the same
hack as the others here.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/ata/pata_hpt366.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/ata/pata_hpt366.c
+++ b/drivers/ata/pata_hpt366.c
@@ -352,7 +352,7 @@ static int hpt36x_init_one(struct pci_de
 	};
 	const struct ata_port_info *ppi[] = { &info_hpt366, NULL };
 
-	void *hpriv = NULL;
+	const void *hpriv = NULL;
 	u32 reg1;
 	int rc;
 
@@ -383,7 +383,7 @@ static int hpt36x_init_one(struct pci_de
 		break;
 	}
 	/* Now kick off ATA set up */
-	return ata_pci_bmdma_init_one(dev, ppi, &hpt36x_sht, hpriv, 0);
+	return ata_pci_bmdma_init_one(dev, ppi, &hpt36x_sht, (void *)hpriv, 0);
 }
 
 #ifdef CONFIG_PM_SLEEP