netdev - Re: [PATCH 4/4] Move USE_WCACHING to drivers/block/pktcdvd.c

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Date:   Sun, 19 Feb 2023 22:20:08 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Thomas Huth <thuth@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        linux-arch@...r.kernel.org, Chas Williams <3chas3@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
        Andrew Waterman <waterman@...s.berkeley.edu>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH 4/4] Move USE_WCACHING to drivers/block/pktcdvd.c

On Fri, Feb 17, 2023 at 09:23:01PM +0100, Thomas Huth wrote:
> From: Palmer Dabbelt <palmer@...belt.com>
> 
> I don't think this was ever intended to be exposed to userspace, but
> it did require an "#ifdef CONFIG_*".  Since the name is kind of
> generic and was only used in one place, I've moved the definition to
> the one user.

I'd just remove USE_WCACHING entirel with something like:

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 2f1a92509271c4..5ae2a80db2c341 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1869,12 +1869,12 @@ static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
 /*
  * enable/disable write caching on drive
  */
-static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
-						int set)
+static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd)
 {
 	struct packet_command cgc;
 	struct scsi_sense_hdr sshdr;
 	unsigned char buf[64];
+	bool set = IS_ENABLED(CONFIG_CDROM_PKTCDVD_WCACHE);
 	int ret;
 
 	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
@@ -1890,7 +1890,12 @@ static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
 	if (ret)
 		return ret;
 
-	buf[pd->mode_offset + 10] |= (!!set << 2);
+	/*
+	 * use drive write caching -- we need deferred error handling to be
+	 * able to successfully recover with this option (drive will return good
+	 * status as soon as the cdb is validated).
+	 */
+	buf[pd->mode_offset + 10] |= (set << 2);
 
 	cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
 	ret = pkt_mode_select(pd, &cgc);
@@ -2085,7 +2090,7 @@ static int pkt_open_write(struct pktcdvd_device *pd)
 		return -EIO;
 	}
 
-	pkt_write_caching(pd, USE_WCACHING);
+	pkt_write_caching(pd);
 
 	ret = pkt_get_max_speed(pd, &write_speed);
 	if (ret)
diff --git a/include/uapi/linux/pktcdvd.h b/include/uapi/linux/pktcdvd.h
index 9cbb55d21c94af..6a5552dfd6af4e 100644
--- a/include/uapi/linux/pktcdvd.h
+++ b/include/uapi/linux/pktcdvd.h
@@ -29,17 +29,6 @@
  */
 #define PACKET_WAIT_TIME	(HZ * 5 / 1000)
 
-/*
- * use drive write caching -- we need deferred error handling to be
- * able to successfully recover with this option (drive will return good
- * status as soon as the cdb is validated).
- */
-#if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
-#define USE_WCACHING		1
-#else
-#define USE_WCACHING		0
-#endif
-
 /*
  * No user-servicable parts beyond this point ->
  */