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Commit bb7b1129 authored by Mike Frysinger's avatar Mike Frysinger
Browse files

Blackfin: outs[lwb]: make sure count is greater than 0 



Some devices will use the outs* funcs with a length of zero, so make sure
we do not write any data in that case.

Reported-by: default avatarGilbert Inho <gneny@edevice.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent b65a0e0c

arch/blackfin/lib/outs.S

+12 −4
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ 
.align 2



ENTRY(_outsl)

	CC = R2 == 0;

	IF CC JUMP 1f;

	P0 = R0;	/* P0 = port */

	P1 = R1;	/* P1 = address */

	P2 = R2;	/* P2 = count */
@@ -20,10 +22,12 @@ ENTRY(_outsl) 
	LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2;

.Llong_loop_s: R0 = [P1++];

.Llong_loop_e: [P0] = R0;

	RTS;

1:	RTS;

ENDPROC(_outsl)



ENTRY(_outsw)

	CC = R2 == 0;

	IF CC JUMP 1f;

	P0 = R0;	/* P0 = port */

	P1 = R1;	/* P1 = address */

	P2 = R2;	/* P2 = count */
@@ -31,10 +35,12 @@ ENTRY(_outsw) 
	LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2;

.Lword_loop_s: R0 = W[P1++];

.Lword_loop_e: W[P0] = R0;

	RTS;

1:	RTS;

ENDPROC(_outsw)



ENTRY(_outsb)

	CC = R2 == 0;

	IF CC JUMP 1f;

	P0 = R0;	/* P0 = port */

	P1 = R1;	/* P1 = address */

	P2 = R2;	/* P2 = count */
@@ -42,10 +48,12 @@ ENTRY(_outsb) 
	LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2;

.Lbyte_loop_s: R0 = B[P1++];

.Lbyte_loop_e: B[P0] = R0;

	RTS;

1:	RTS;

ENDPROC(_outsb)



ENTRY(_outsw_8)

	CC = R2 == 0;

	IF CC JUMP 1f;

	P0 = R0;	/* P0 = port */

	P1 = R1;	/* P1 = address */

	P2 = R2;	/* P2 = count */
@@ -56,5 +64,5 @@ ENTRY(_outsw_8) 
		R0 = R0 << 8;

		R0 = R0 + R1;

.Lword8_loop_e: W[P0] = R0;

	RTS;

1:	RTS;

ENDPROC(_outsw_8)