linux-kernel - [PATCH-SPEAKUP 2/2] remove unecessary initial allocation of vc

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Date:   Wed, 22 Feb 2017 12:50:27 +0530
From:   "Pranay Kr. Srivastava" <pranjas@...il.com>
To:     w.d.hubbs@...il.com, chris@...-brannons.com, kirk@...sers.ca,
        samuel.thibault@...-lyon.org, gregkh@...uxfoundation.org,
        sfr@...b.auug.org.au, speakup@...ux-speakup.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc:     "Pranay Kr. Srivastava" <pranjas@...il.com>
Subject: [PATCH-SPEAKUP 2/2] remove unecessary initial allocation of vc

This patch removes the unnecessary allocation of
current foreground vc during initialization.

This initialization is already handled in the loop
that follows it for all available virtual consoles.

Also change the prototype of speakup_allocate to take
extra argument of gfp_* flags. Thus not requiring
GFP_ATOMIC during initialization.

Signed-off-by: Pranay Kr. Srivastava <pranjas@...il.com>
---
 drivers/staging/speakup/main.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/speakup/main.c b/drivers/staging/speakup/main.c
index 6667cf2..f81a936 100644
--- a/drivers/staging/speakup/main.c
+++ b/drivers/staging/speakup/main.c
@@ -1327,14 +1327,14 @@ static int edit_bits(struct vc_data *vc, u_char type, u_char ch, u_short key)
 }
 
 /* Allocation concurrency is protected by the console semaphore */
-static int speakup_allocate(struct vc_data *vc)
+static int speakup_allocate(struct vc_data *vc, gfp_t gfp_flags)
 {
 	int vc_num;
 
 	vc_num = vc->vc_num;
 	if (speakup_console[vc_num] == NULL) {
 		speakup_console[vc_num] = kzalloc(sizeof(*speakup_console[0]),
-						  GFP_ATOMIC);
+						  gfp_flags);
 		if (speakup_console[vc_num] == NULL)
 			return -ENOMEM;
 		speakup_date(vc);
@@ -2257,7 +2257,7 @@ static int vt_notifier_call(struct notifier_block *nb,
 	switch (code) {
 	case VT_ALLOCATE:
 		if (vc->vc_mode == KD_TEXT)
-			speakup_allocate(vc);
+			speakup_allocate(vc, GFP_ATOMIC);
 		break;
 	case VT_DEALLOCATE:
 		speakup_deallocate(vc);
@@ -2317,7 +2317,6 @@ static int __init speakup_init(void)
 {
 	int i;
 	long err = 0;
-	struct st_spk_t *first_console;
 	struct vc_data *vc = vc_cons[fg_console].d;
 	struct var_t *var;
 
@@ -2342,18 +2341,9 @@ static int __init speakup_init(void)
 	if (err)
 		goto error_virtkeyboard;
 
-	first_console = kzalloc(sizeof(*first_console), GFP_KERNEL);
-	if (!first_console) {
-		err = -ENOMEM;
-		goto error_alloc;
-	}
-
-	speakup_console[vc->vc_num] = first_console;
-	speakup_date(vc);
-
 	for (i = 0; i < MAX_NR_CONSOLES; i++)
 		if (vc_cons[i].d) {
-			err = speakup_allocate(vc_cons[i].d);
+			err = speakup_allocate(vc_cons[i].d, GFP_KERNEL);
 			if (err)
 				goto error_kobjects;
 		}
@@ -2412,7 +2402,6 @@ static int __init speakup_init(void)
 	for (i = 0; i < MAX_NR_CONSOLES; i++)
 		kfree(speakup_console[i]);
 
-error_alloc:
 	speakup_remove_virtual_keyboard();
 
 error_virtkeyboard:
-- 
2.10.2