iwlwifi: limit rx bufs to 2048

Recent devices are configured with 4096 RX pages that lead to an
increased memory usage. For the moment lower the amount to 2048
and treat in potientially lower throughput for more conservative
memory consumption.

Fixes #4801.

repos/dde_linux/patches/iwlwifi_limit_rx_bufs.patch

@@ -0,0 +1,13 @@
+--- src/linux/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
++++ src/linux/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
+@@ -1656,6 +1656,10 @@
+ 		trans_pcie->num_rx_bufs = RX_QUEUE_SIZE;
+ 	}
+ 
++	/* limit some recent cards that use 4096 */
++	if (trans_pcie->num_rx_bufs > 2048)
++		trans_pcie->num_rx_bufs = 2048;
++
+ 	ret = iwl_trans_init(iwl_trans);
+ 	if (ret)
+ 		goto out_free_trans;

repos/dde_linux/ports/linux.hash

@@ -1 +1 @@
-f1d1430a9c52da43e837a5d788f312a17100311e
+0c5bbb2cab108531df25b2c92610ce92c57abc87

repos/dde_linux/ports/linux.port

@@ -11,6 +11,7 @@ DIR(linux) := src/linux
 #
 PATCH_FILES := i915_irq.patch i915_fb_resize.patch \
                iwlwifi_enable_irq_before_pnvm.patch \
+               iwlwifi_limit_rx_bufs.patch \
                usb_message.patch \
                workqueue_deadlock.patch
 PATCHES += $(addprefix patches/,$(PATCH_FILES))