fa-zio-drv.c: improve zfad_get_chx_index() readability

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

fa-zio-drv.c: improve zfad_get_chx_index() readability
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
77d1a9fe · Federico Vaga · e09fb80f · 77d1a9fe
Commit 77d1a9fe authored Apr 29, 2013 by Federico Vaga
Hide whitespace changes
Inline Side-by-side

Showing with 6 additions and 1 deletion

fa-zio-drv.c kernel/fa-zio-drv.c +6 -1

No files found.
--- a/kernel/fa-zio-drv.c
+++ b/kernel/fa-zio-drv.c
@@ -236,7 +236,12 @@ static struct zio_attribute zfad_dev_ext_zattr[] = {
 static inline int zfad_get_chx_index(unsigned long addr,
 				     struct zio_channel *chan)
 {
-	return addr + ZFA_CHx_MULT  * (1 + chan->index - chan->cset->n_chan);
+	int offset;
+
+	/* (n_chan - 1) because of interleave */
+	offset = ZFA_CHx_MULT  * ((chan->cset->n_chan - 1) - chan->index);
+
+	return addr - offset;
 }