net: ipa: record and use the number of defined endpoint IDs

Define a new field in the IPA structure that records the maximum
number of entries that will be used in the IPA endpoint array.  Use
that value rather than IPA_ENDPOINT_MAX to determine the end
condition for two loops that iterate over all endpoints.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/ipa.h

@@ -61,6 +61,7 @@ struct ipa_interrupt;
  * @zero_addr:		DMA address of preallocated zero-filled memory
  * @zero_virt:		Virtual address of preallocated zero-filled memory
  * @zero_size:		Size (bytes) of preallocated zero-filled memory
+ * @endpoint_count:	Number of endpoints represented by bit masks below
  * @defined:		Bit mask indicating endpoints defined in config data
  * @available:		Bit mask indicating endpoints hardware supports
  * @filter_map:		Bit mask indicating endpoints that support filtering
@@ -117,6 +118,7 @@ struct ipa {
 	size_t zero_size;
 
 	/* Bit masks indicating endpoint state */
+	u32 endpoint_count;
 	u32 defined;			/* Defined in configuration data */
 	u32 available;			/* Supported by hardware */
 	u32 filter_map;

drivers/net/ipa/ipa_endpoint.c

@@ -433,7 +433,7 @@ void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
 {
 	u32 endpoint_id = 0;
 
-	while (endpoint_id < IPA_ENDPOINT_MAX) {
+	while (endpoint_id < ipa->endpoint_count) {
 		struct ipa_endpoint *endpoint = &ipa->endpoint[endpoint_id++];
 
 		if (endpoint->ee_id != GSI_EE_MODEM)
@@ -1015,7 +1015,7 @@ void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
 {
 	u32 endpoint_id = 0;
 
-	while (endpoint_id < IPA_ENDPOINT_MAX) {
+	while (endpoint_id < ipa->endpoint_count) {
 		struct ipa_endpoint *endpoint = &ipa->endpoint[endpoint_id++];
 
 		if (endpoint->toward_ipa || endpoint->ee_id != GSI_EE_MODEM)
@@ -1982,7 +1982,9 @@ u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
 
 	BUILD_BUG_ON(!IPA_REPLENISH_BATCH);
 
-	if (!ipa_endpoint_max(ipa, count, data))
+	/* Number of endpoints is one more than the maximum ID */
+	ipa->endpoint_count = ipa_endpoint_max(ipa, count, data) + 1;
+	if (!ipa->endpoint_count)
 		return 0;	/* Error */
 
 	ipa->defined = 0;