Icarus: Abandon a scanhash early when work restart requested

driver-icarus.c

@@ -55,8 +55,8 @@
 #include "miner.h"
 
 // 8 second timeout
-#define ICARUS_READ_FAULT_DECISECONDS (10)
-#define ICARUS_READ_FAULT_COUNT	(8)
+#define ICARUS_READ_FAULT_DECISECONDS (1)
+#define ICARUS_READ_FAULT_COUNT	(80)
 
 struct device_api icarus_api;
 
@@ -114,7 +114,7 @@ static int icarus_open(const char *devpath)
 #endif
 }
 
-static int icarus_gets(unsigned char *buf, size_t bufLen, int fd)
+static int icarus_gets(unsigned char *buf, size_t bufLen, int fd, volatile unsigned long *wr)
 {
 	ssize_t ret = 0;
 	int rc = 0;
@@ -147,6 +147,8 @@ static int icarus_gets(unsigned char *buf, size_t bufLen, int fd)
 		}
 
 		rc++;
+		if (*wr)
+			return 1;
 		if (rc == ICARUS_READ_FAULT_COUNT) {
 			if (epollfd != -1)
 				close(epollfd);
@@ -202,7 +204,8 @@ static bool icarus_detect_one(const char *devpath)
 	icarus_write(fd, ob_bin, sizeof(ob_bin));
 
 	memset(nonce_bin, 0, sizeof(nonce_bin));
-	icarus_gets(nonce_bin, sizeof(nonce_bin), fd);
+	volatile unsigned long wr = 0;
+	icarus_gets(nonce_bin, sizeof(nonce_bin), fd, &wr);
 
 	icarus_close(fd);
 
@@ -273,6 +276,9 @@ static bool icarus_prepare(struct thr_info *thr)
 static uint64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 				__maybe_unused uint64_t max_nonce)
 {
+	volatile unsigned long *wr = &work_restart[thr->id].restart;
+	*wr = 0;
+
 	struct cgpu_info *icarus;
 	int fd;
 	int ret;
@@ -308,7 +314,7 @@ static uint64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 
 	/* Icarus will return 8 bytes nonces or nothing */
 	memset(nonce_bin, 0, sizeof(nonce_bin));
-	ret = icarus_gets(nonce_bin, sizeof(nonce_bin), fd);
+	ret = icarus_gets(nonce_bin, sizeof(nonce_bin), fd, wr);
 
 	nonce_hex = bin2hex(nonce_bin, sizeof(nonce_bin));
 	if (nonce_hex) {