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-rw-r--r--spi.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/spi.c b/spi.c
index 20e8828..4c01b31 100644
--- a/spi.c
+++ b/spi.c
@@ -227,12 +227,15 @@ static int it8716f_spi_command(uint16_t port, unsigned int writecnt, unsigned in
* We can't use writecnt directly, but have to use a strange encoding.
*/
outb(((0x4 + (fast_spi ? 1 : 0)) << 4) | ((readcnt & 0x3) << 2) | (writeenc), port);
- do {
- busy = inb(port) & 0x80;
- } while (busy);
- for (i = 0; i < readcnt; i++) {
- readarr[i] = inb(port + 5 + i);
+ if (readcnt > 0) {
+ do {
+ busy = inb(port) & 0x80;
+ } while (busy);
+
+ for (i = 0; i < readcnt; i++) {
+ readarr[i] = inb(port + 5 + i);
+ }
}
return 0;
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