net/ena/base: limit exponential backoff

[ upstream commit 4b378679c88ff231b97b71aaedc2d424e82f1aba ]

Limit the value of the exponent used for this backoff
at (1<<16) to prevent it from reaching to an excessive
value (1<<32) or potentially even overflowing.
In addition, for uniformity and readability purposes,
the min/max parameter in the calls of ENA_MIN32 and
ENA_MAX32 macros was changed to be first.

Fixes: 0c84e04 ("net/ena/base: make delay exponential in polling functions")

Signed-off-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Amit Bernstein <amitbern@amazon.com>

drivers/net/ena/base/ena_com.c

@@ -34,6 +34,8 @@
 
 #define ENA_REGS_ADMIN_INTR_MASK 1
 
+#define ENA_MAX_BACKOFF_DELAY_EXP 16U
+
 #define ENA_MIN_ADMIN_POLL_US 100
 
 #define ENA_MAX_ADMIN_POLL_US 5000
@@ -539,8 +541,9 @@ static int ena_com_comp_status_to_errno(struct ena_com_admin_queue *admin_queue,
 
 static void ena_delay_exponential_backoff_us(u32 exp, u32 delay_us)
 {
+	exp = ENA_MIN32(ENA_MAX_BACKOFF_DELAY_EXP, exp);
 	delay_us = ENA_MAX32(ENA_MIN_ADMIN_POLL_US, delay_us);
-	delay_us = ENA_MIN32(delay_us * (1U << exp), ENA_MAX_ADMIN_POLL_US);
+	delay_us = ENA_MIN32(ENA_MAX_ADMIN_POLL_US, delay_us * (1U << exp));
 	ENA_USLEEP(delay_us);
 }