linux-kernel - [resend, PATCH v1 2/3] parport: Use list_for

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Date:   Mon, 16 Oct 2023 16:31:34 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Joel Granados <j.granados@...sung.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Cc:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [resend, PATCH v1 2/3] parport: Use list_for_each() helper

Convert hard to read custom code to list_for_each().
No functional changes intended.

Note, we may not use list_for_each_entry() as at the end of the list
the iterator will point to an invalid entry and may not be dereferenced.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/parport/share.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/parport/share.c b/drivers/parport/share.c
index 8037bcd07bcf..38780f6a9119 100644
--- a/drivers/parport/share.c
+++ b/drivers/parport/share.c
@@ -469,9 +469,11 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma,
 	/* Search for the lowest free parport number. */
 
 	spin_lock(&full_list_lock);
-	for (l = all_ports.next, num = 0; l != &all_ports; l = l->next, num++) {
+	num = 0;
+	list_for_each(l, &all_ports) {
 		struct parport *p = list_entry(l, struct parport, full_list);
-		if (p->number != num)
+
+		if (p->number != num++)
 			break;
 	}
 	tmp->portnum = tmp->number = num;
-- 
2.40.0.1.gaa8946217a0b