linux-kernel - [PATCH 5.4 158/168] Revert "serial: uartps: Fix uartps

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Message-Id: <20200428182251.102233817@linuxfoundation.org>
Date:   Tue, 28 Apr 2020 20:25:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Michal Simek <michal.simek@...inx.com>
Subject: [PATCH 5.4 158/168] Revert "serial: uartps: Fix uartps_major handling"

From: Michal Simek <michal.simek@...inx.com>

commit 2e01911b7cf7aa07a304a809eca1b11a4bd35859 upstream.

This reverts commit 5e9bd2d70ae7c00a95a22994abf1eef728649e64.

As Johan says, this driver needs a lot more work and these changes are
only going in the wrong direction:
    https://lkml.kernel.org/r/20190523091839.GC568@localhost

Reported-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/310999ab5342f788a7bc1b0e68294d4f052cad07.1585905873.git.michal.simek@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/xilinx_uartps.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1550,6 +1550,7 @@ static int cdns_uart_probe(struct platfo
 		goto err_out_id;
 	}
 
+	uartps_major = cdns_uart_uart_driver->tty_driver->major;
 	cdns_uart_data->cdns_uart_driver = cdns_uart_uart_driver;
 
 	/*
@@ -1679,7 +1680,6 @@ static int cdns_uart_probe(struct platfo
 		console_port = NULL;
 #endif
 
-	uartps_major = cdns_uart_uart_driver->tty_driver->major;
 	cdns_uart_data->cts_override = of_property_read_bool(pdev->dev.of_node,
 							     "cts-override");
 	return 0;
@@ -1741,12 +1741,6 @@ static int cdns_uart_remove(struct platf
 		console_port = NULL;
 #endif
 
-	/* If this is last instance major number should be initialized */
-	mutex_lock(&bitmap_lock);
-	if (bitmap_empty(bitmap, MAX_UART_INSTANCES))
-		uartps_major = 0;
-	mutex_unlock(&bitmap_lock);
-
 	uart_unregister_driver(cdns_uart_data->cdns_uart_driver);
 	return rc;
 }