linux-kernel - [PATCH] drivers/tty: don't use the byte channel handle as a parameter in ehv

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Message-ID: <1316543217-13769-1-git-send-email-timur@freescale.com>
Date:	Tue, 20 Sep 2011 13:26:57 -0500
From:	Timur Tabi <timur@...escale.com>
To:	<greg@...ah.com>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...abs.org>, <linux-console@...r.kernel.org>
Subject: [PATCH] drivers/tty: don't use the byte channel handle as a parameter in ehv_bytechan.c

The ePAPR hypervisor byte channel console driver only supports one byte
channel as a console, and the byte channel handle is stored in a global
variable.  It doesn't make any sense to pass that handle as a parameter
to the console functions, since these functions already have access to the
global variable.

This change also fixes this compilation warning on a 64-bit kernel:

  CC      drivers/tty/ehv_bytechan.o
drivers/tty/ehv_bytechan.c: In function 'ehv_bc_console_write':
drivers/tty/ehv_bytechan.c:289:24: warning: cast from pointer to integer of different size
drivers/tty/ehv_bytechan.c: In function 'ehv_bc_console_init':
drivers/tty/ehv_bytechan.c:355:24: warning: cast to pointer from integer of different size

This warning is because the driver is converting the integer byte channel
handle to/from the void* 'data' field of struct console.  Rather than fix
the warning, we just eliminate the code altogether.

Signed-off-by: Timur Tabi <timur@...escale.com>
---
 drivers/tty/ehv_bytechan.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/ehv_bytechan.c b/drivers/tty/ehv_bytechan.c
index e67f70b..b24e6f7 100644
--- a/drivers/tty/ehv_bytechan.c
+++ b/drivers/tty/ehv_bytechan.c
@@ -286,7 +286,6 @@ static int ehv_bc_console_byte_channel_send(unsigned int handle, const char *s,
 static void ehv_bc_console_write(struct console *co, const char *s,
 				 unsigned int count)
 {
-	unsigned int handle = (unsigned int)co->data;
 	char s2[EV_BYTE_CHANNEL_MAX_BYTES];
 	unsigned int i, j = 0;
 	char c;
@@ -299,14 +298,14 @@ static void ehv_bc_console_write(struct console *co, const char *s,
 
 		s2[j++] = c;
 		if (j >= (EV_BYTE_CHANNEL_MAX_BYTES - 1)) {
-			if (ehv_bc_console_byte_channel_send(handle, s2, j))
+			if (ehv_bc_console_byte_channel_send(stdout_bc, s2, j))
 				return;
 			j = 0;
 		}
 	}
 
 	if (j)
-		ehv_bc_console_byte_channel_send(handle, s2, j);
+		ehv_bc_console_byte_channel_send(stdout_bc, s2, j);
 }
 
 /*
@@ -352,8 +351,6 @@ static int __init ehv_bc_console_init(void)
 			   CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE);
 #endif
 
-	ehv_bc_console.data = (void *)stdout_bc;
-
 	/* add_preferred_console() must be called before register_console(),
 	   otherwise it won't work.  However, we don't want to enumerate all the
 	   byte channels here, either, since we only care about one. */
-- 
1.7.3.4


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