The dgap driver contains three functions: dgap_cmdb(), dgap_cmdw()
and dgap_cmdw_exit which are contain duplicated code which waits
if necessary before updating the pointer to limit outstanding
commands. This patch introduces the wait_for_fep_cmds_limit()
function which is will be called from these functions to prevent
code duplication.
---
drivers/staging/dgap/dgap.c | 103 ++++++++++++++++----------------------------
1 file changed, 37 insertions(+), 66 deletions(-)
diff --git a/drivers/staging/dgap/dgap.c b/drivers/staging/dgap/dgap.c
index bad3551..0a20253 100644
--- a/drivers/staging/dgap/dgap.c
+++ b/drivers/staging/dgap/dgap.c
@@ -2328,6 +2328,37 @@ schedule_poller:
add_timer(&dgap_poll_timer);
}
+
+/*
+ * Wait if necessary before updating the head
+ * pointer to limit the number of outstanding
+ * commands to the FEP. If the time spent waiting
+ * is outlandish, declare the FEP dead.
+ */
+static void wait_for_fep_cmds_limit(struct channel_t *ch,
+ struct __iomem cm_t *cm_addr,
+ u16 head, u16 tail, uint ncmds)
+{
+ int n;
+ int count;
+
+ for (count = dgap_count ;;) {
+ head = readw(&cm_addr->cm_head);
+ tail = readw(&cm_addr->cm_tail);
+
+ n = (head - tail) & (CMDMAX - CMDSTART - 4);
+
+ if (n <= ncmds * sizeof(struct cm_t))
+ break;
+
+ if (--count == 0) {
+ ch->ch_bd->state = BOARD_FAILED;
+ return;
+ }
+ udelay(10);
+ }
+}
+
/*=======================================================================
*
* dgap_cmdb - Sends a 2 byte command to the FEP.
@@ -2345,8 +2376,6 @@ static void dgap_cmdb(struct channel_t *ch, u8 cmd, u8 byte1,
{
char __iomem *vaddr;
struct __iomem cm_t *cm_addr;
- uint count;
- uint n;
u16 head;
u16 tail;
@@ -2391,27 +2420,9 @@ static void dgap_cmdb(struct channel_t *ch, u8 cmd, u8 byte1,
writew(head, &cm_addr->cm_head);
- /*
- * Wait if necessary before updating the head
- * pointer to limit the number of outstanding
- * commands to the FEP. If the time spent waiting
- * is outlandish, declare the FEP dead.
- */
- for (count = dgap_count ;;) {
- head = readw(&cm_addr->cm_head);
- tail = readw(&cm_addr->cm_tail);
-
- n = (head - tail) & (CMDMAX - CMDSTART - 4);
+ wait_for_fep_cmds_limit(ch, cm_addr, head, tail, ncmds);
- if (n <= ncmds * sizeof(struct cm_t))
- break;
-
- if (--count == 0) {
- ch->ch_bd->state = BOARD_FAILED;
- return;
- }
- udelay(10);
- }
+ return;
}
/*=======================================================================
@@ -2429,8 +2440,6 @@ static void dgap_cmdw(struct channel_t *ch, u8 cmd, u16 word, uint ncmds)
{
char __iomem *vaddr;
struct __iomem cm_t *cm_addr;
- uint count;
- uint n;
u16 head;
u16 tail;
@@ -2473,27 +2482,9 @@ static void dgap_cmdw(struct channel_t *ch, u8 cmd, u16 word, uint ncmds)
writew(head, &cm_addr->cm_head);
- /*
- * Wait if necessary before updating the head
- * pointer to limit the number of outstanding
- * commands to the FEP. If the time spent waiting
- * is outlandish, declare the FEP dead.
- */
- for (count = dgap_count ;;) {
- head = readw(&cm_addr->cm_head);
- tail = readw(&cm_addr->cm_tail);
-
- n = (head - tail) & (CMDMAX - CMDSTART - 4);
+ wait_for_fep_cmds_limit(ch, cm_addr, head, tail, ncmds);
- if (n <= ncmds * sizeof(struct cm_t))
- break;
-
- if (--count == 0) {
- ch->ch_bd->state = BOARD_FAILED;
- return;
- }
- udelay(10);
- }
+ return;
}
/*=======================================================================
@@ -2511,8 +2502,6 @@ static void dgap_cmdw_ext(struct channel_t *ch, u16 cmd, u16 word, uint ncmds)
{
char __iomem *vaddr;
struct __iomem cm_t *cm_addr;
- uint count;
- uint n;
u16 head;
u16 tail;
@@ -2567,27 +2556,9 @@ static void dgap_cmdw_ext(struct channel_t *ch, u16 cmd, u16 word, uint ncmds)
writew(head, &cm_addr->cm_head);
- /*
- * Wait if necessary before updating the head
- * pointer to limit the number of outstanding
- * commands to the FEP. If the time spent waiting
- * is outlandish, declare the FEP dead.
- */
- for (count = dgap_count ;;) {
- head = readw(&cm_addr->cm_head);
- tail = readw(&cm_addr->cm_tail);
-
- n = (head - tail) & (CMDMAX - CMDSTART - 4);
+ wait_for_fep_cmds_limit(ch, cm_addr, head, tail, ncmds);
- if (n <= ncmds * sizeof(struct cm_t))
- break;
-
- if (--count == 0) {
- ch->ch_bd->state = BOARD_FAILED;
- return;
- }
- udelay(10);
- }
+ return;
}
/*=======================================================================
--
2.5.0
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