linux-kernel - Re: [PATCH v5 char-misc-next] misc: microchip: pci1xxxx: Add OTP/EEPROM driver for the pci1xxxx switch

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Message-ID: <Y+iQnfR65M0El34R@kroah.com>
Date:   Sun, 12 Feb 2023 08:09:17 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        arnd@...db.de, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v5 char-misc-next] misc: microchip: pci1xxxx: Add
 OTP/EEPROM driver for the pci1xxxx switch

On Sun, Feb 12, 2023 at 09:27:43AM +0530, Tharun Kumar P wrote:
> +	/* Wait for the EPC_BUSY bit to get cleared */
> +	do {
> +		data = readl(priv->reg_base + MMAP_EEPROM_OFFSET(EEPROM_CMD_REG));
> +	} while (data & EEPROM_CMD_EPC_BUSY_BIT);

Again, you can not sit and spin in a busy-wait like this with no chance
to recover if something goes wrong with the hardware (hint, what if it
got removed?)

please fix.

thanks,

greg k-h