linux-kernel - [PATCH 4.14 005/239] Revert "Input: synaptics-rmi4

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Date:   Tue, 19 Nov 2019 06:16:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Evan Green <evgreen@...omium.org>
Subject: [PATCH 4.14 005/239] Revert "Input: synaptics-rmi4 - avoid processing unknown IRQs"

From: Evan Green <evgreen@...omium.org>

This reverts commit 7b9f7a928255a232012be55cb95db30e963b83a7.

That change should have had a fixes tag for
commit 24d28e4f1271 ("Input: synaptics-rmi4 - convert irq distribution to
irq_domain"). The conversion to irq_domain introduced the issue being
fixed by this commit.

In older kernels the bitmap IRQ accounting is done differently, and
it doesn't suffer from the same issue of calling handle_nested_irq(0).
Keeping this commit on kernels 4.14 and older causes problems with
touchpads due to the different semantics of the IRQ bitmasks.

Signed-off-by: Evan Green <evgreen@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/rmi4/rmi_driver.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -165,7 +165,7 @@ static int rmi_process_interrupt_request
 	}
 
 	mutex_lock(&data->irq_mutex);
-	bitmap_and(data->irq_status, data->irq_status, data->fn_irq_bits,
+	bitmap_and(data->irq_status, data->irq_status, data->current_irq_mask,
 	       data->irq_count);
 	/*
 	 * At this point, irq_status has all bits that are set in the
@@ -412,8 +412,6 @@ static int rmi_driver_set_irq_bits(struc
 	bitmap_copy(data->current_irq_mask, data->new_irq_mask,
 		    data->num_of_irq_regs);
 
-	bitmap_or(data->fn_irq_bits, data->fn_irq_bits, mask, data->irq_count);
-
 error_unlock:
 	mutex_unlock(&data->irq_mutex);
 	return error;
@@ -427,8 +425,6 @@ static int rmi_driver_clear_irq_bits(str
 	struct device *dev = &rmi_dev->dev;
 
 	mutex_lock(&data->irq_mutex);
-	bitmap_andnot(data->fn_irq_bits,
-		      data->fn_irq_bits, mask, data->irq_count);
 	bitmap_andnot(data->new_irq_mask,
 		  data->current_irq_mask, mask, data->irq_count);