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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: Gilbert Inho <gneny@edevice.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-01-26 18:10:44 +00:00
parent b65a0e0c84
commit bb7b11290a
1 changed files with 12 additions and 4 deletions
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16
arch/blackfin/lib/outs.S
View File

@ -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)