EDAC/dmc520: Don't print an error for each unconfigured interrupt line

[ Upstream commit ad2df24 ]

The dmc520 driver requires that at least one interrupt line, out of the
ten possible, is configured. The driver prints an error and returns
-EINVAL from its .probe function if there are no interrupt lines
configured.

Don't print a KERN_ERR level message for each interrupt line that's
unconfigured as that can confuse users into thinking that there is an
error condition.

Before this change, the following KERN_ERR level messages would be
reported if only dram_ecc_errc and dram_ecc_errd were configured in the
device tree:

  dmc520 68000000.dmc: IRQ ram_ecc_errc not found
  dmc520 68000000.dmc: IRQ ram_ecc_errd not found
  dmc520 68000000.dmc: IRQ failed_access not found
  dmc520 68000000.dmc: IRQ failed_prog not found
  dmc520 68000000.dmc: IRQ link_err not
  dmc520 68000000.dmc: IRQ temperature_event not found
  dmc520 68000000.dmc: IRQ arch_fsm not found
  dmc520 68000000.dmc: IRQ phy_request not found

Fixes: 1088750 ("EDAC: Add EDAC driver for DMC520")
Reported-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220111163800.22362-1-tyhicks@linux.microsoft.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/edac/dmc520_edac.c

@@ -489,7 +489,7 @@ static int dmc520_edac_probe(struct platform_device *pdev)
 	dev = &pdev->dev;
 
 	for (idx = 0; idx < NUMBER_OF_IRQS; idx++) {
-		irq = platform_get_irq_byname(pdev, dmc520_irq_configs[idx].name);
+		irq = platform_get_irq_byname_optional(pdev, dmc520_irq_configs[idx].name);
 		irqs[idx] = irq;
 		masks[idx] = dmc520_irq_configs[idx].mask;
 		if (irq >= 0) {